Archives for posts with tag: iq

African pygmies evolved their short stature twice“In the rainforests of Africa, being small is so helpful that it evolved twice in separate groups. Luis Barreiro of the University of Montreal in Quebec, Canada, and his colleagues identified 16 regions of the genome associated with short stature in the Batwa pygmies of Uganda. They then compared these regions in 169 Batwa and 74 Baka pygmies from West Africa. ‘In both groups, there was greater variation in those regions associated with being short, but no overlap between them,’ says Barreiro. This suggests they evolved their stature independently instead of inheriting the same ‘pygmy genes’ from a common ancestor.”

The strange history of the North American Arctic“Archaeologists mapping ancient cultures in the North American Arctic — a region spanning present-day Greenland — have long puzzled over how different cultures relate to one another. Now, an unprecedented large-scale genomics study has traced many such cultures to the Paleo-Eskimos, a people who early inhabited the harsh environment continuously for 4000 years, only to vanish mysteriously about 700 years ago. The discovery could change how scientists understand migration patterns in the North American Arctic…. After comparing the ancient and modern genetic data, the researchers found that the Saqqaq and Dorset cultures belonged to one Paleo-Eskimo people, whose genetic lineage continued in the region for more than 4000 years, from 3000 B.C.E. to 1300 C.E., contradicting previous theories that the diverse cultures came from different peoples. The Paleo-Eskimos are genetically distinct from Native Americans and Inuits, which means they represent a separate, later pulse of migration into the New World, says evolutionary geneticist Eske Willerslev of the University of Copenhagen, a co-author of the study. This contradicts previous theories that humans arrived in the Americas in three waves, painting a scenario of four waves instead — the Amerinds, the Na Dene Native Americans, the Paleo-Eskimos, and the Neo-Eskimo Thules…. What intrigues researchers most is why the Paleo-Eskimo lineage disappeared after the late Dorsets, around the same time that Neo-Eskimo Thules expanded rapidly to the Arctic. Archaeologists have found no evidence of violent conflict between the Thules and the Dorsets, but it would be hard to ignore contrasts between the two groups. The whale-hunting Thules lived in large, well-organized villages and boasted advanced technologies such as dog sleds and sinew-backed bows. The Dorsets, on the other hand, lived in small villages of 20 to 30 people and hunted with chipped stone blades. The researchers suspect that the Dorsets might have been pushed out to the fringes of the Arctic, or perhaps annihilated by a disease. ‘It’s just mind-blowing to imagine an entire people who just completely vanished,’ Willerslev says.” — see also Degüello from greg cochran.

Genetic changes transformed wild rabbits into tame bunnies, DNA study reveals“When humans domesticated wild rabbits and turned them into pet store favorites, they also changed their genome, a study has found…. The domestication of rabbits happened much more recently than that of cattle, sheep, pigs and dogs, which happened between about 15,000 and 9,000 years ago. Monks in monasteries in the south of France first domesticated northwestern europeans rabbits around 1,400 years ago…. [T]he researches report in the journal Science, small pre-existing genetic variations — sometimes just one letter of DNA code — started to become more common in the animals as they became domesticated. These variations generally didn’t affect the genes themselves, but rather acted on the genome’s regulatory regions, which are in control of whether genes are turned on or off. ‘Wild and domestic rabbits do not differ so much in actual protein sequences, but in how gene and protein expression is regulated,’ says Andersson. Among the genes particularly targeted during domestication were those involved in rabbits’ brains and nervous systems. That’s to be expected, Andersson says, because the differences between domestic and wild rabbits are almost all behavioral, while physical differences are slight…. Domestication of rabbits was made easier because the wild variety is a highly polymorphic species that already possesses many of gene variants selectively enhanced during domestication, the researchers say. That is likely to have been the case with most domesticated species, they say. ‘We predict that a similar process has occurred in other domestic animals and that we will not find a few specific genes that were critical for domestication,’ Andersson says.” — see also: Rabbit genome analysis reveals a polygenic basis for phenotypic change during domestication.

Comparative population genomics in animals uncovers the determinants of genetic diversity – h/t lars penke! who tweeted: “Across species, higher genetic diversity is not predicted by ecology, but by faster life history.”

Genome-wide genotype and sequence-based reconstruction of the 140,000 year history of modern human ancestry“We investigated ancestry of 3,528 modern humans from 163 samples. We identified 19 ancestral components, with 94.4% of individuals showing mixed ancestry. After using whole genome sequences to correct for ascertainment biases in genome-wide genotype data, we dated the oldest divergence event to 140,000 years ago. We detected an Out-of-Africa migration 100,000–87,000 years ago, leading to peoples of the Americas, east and north Asia, and Oceania, followed by another migration 61,000–44,000 years ago, leading to peoples of the Caucasus, Europe, the Middle East, and south Asia. We dated eight divergence events to 33,000–20,000 years ago, coincident with the Last Glacial Maximum. We refined understanding of the ancestry of several ethno-linguistic groups, including African Americans, Ethiopians, the Kalash, Latin Americans, Mozabites, Pygmies, and Uygurs, as well as the CEU sample. Ubiquity of mixed ancestry emphasizes the importance of accounting for ancestry in history, forensics, and health.” — don’t miss figure 2!

Seals May Have Carried Tuberculosis To The New World — thousand-year-old skeletons from peru suggest seals brought tuberculosis to americas.

Y Chromosomes of 40% Chinese Descend from Three Neolithic Super-Grandfathers“This observation suggests that the main patrilineal expansion in China occurred in the Neolithic Era and might be related to the development of agriculture.”

Blue Eyes Are More Common Than Any Other Colour in Britain“The Blue Eyes Project has found that although all eyes in Britain were once brown, they are now 48% blue, 30% green and just 22% brown…. The study mapped eye colour across the UK and Ireland and found that Scottish and Irish people are more likely to have blue eyes than in other parts of the UK, particularly the south. Just over a third (35%) of the population of south-west England and 41% in east England have blue eyes, compared to 57% in southeast Scotland…. Blue eyes are the result of a variant in the HERC2 gene, which, when it mutates, switches off the supply of brown-eye forming melanin, researchers say. Green eyes are also a result of this change, because they arise from a combination of the blue variant with brown. The first gene mutation resulting in blue eyes is understood to have occurred in the Baltic region around 10,000 years ago.”

Neanderthals in Europe Died Out Thousands of Years Sooner Than Some Thought, Study Says

The Other Neanderthal – h/t billare! who tweeted: “‘Denisovans are an example of…how mitochondrial DNA [misleads], & only the nuclear genome tells the full story.'”

Admixture in South African Afrikaners — from razib.

Finland’s love of milk dates back to the Stone Age“A combined team from the Universities of Bristol (England) and Helsinki (Finland) have been examining examples of Corded Ware pottery found in the northern parts of Finland. The pieces examined were cooking pots dated at 3,900 to 3,300 BCE and also approx. 2,500 BCE. Astonishingly the pots from 2,500 BCE contained traces of milk fats. This proved that the inhabitants at that time, despite a climate where it can snow for up to four months of the year, had domesticated animals.”

Holding a Mirror to Their Natures“[U]nrelated look-alikes showed little similarity in either personality or self-esteem. By contrast, twins — especially identical twins — score similarly on both scales, suggesting that the likeness is largely because of genetics…. Personality traits do not appear to be influenced by the way people are treated because of appearance. Moreover, they found, there appears to be no special bond between look-alikes. Helen Fisher, a biological anthropologist at Rutgers University who is also an identical twin, praised that study, saying it went to the heart of what makes people form a bond. ‘Even in cases where a person is a dead ringer for another, the natural pull is not there,’ Dr. Fisher said, ‘which builds the case that there is an underlying biology to kinship.'” — h/t steve stewart williams!

On the genetic architecture of intelligence and other quantitative traits — from steve hsu. h/t richard harper! who tweeted: “cognitive ability gene search requires sample sizes of 10,000 genes across a million persons.”

Genes Influence Young Children’s Human Figure Drawings and Their Association With Intelligence a Decade Later“Do genes influence individual differences in this species-typical behavior, and is drawing related to intelligence (g) in modern children? We report on the first genetically informative study of children’s figure drawing. In a study of 7,752 pairs of twins, we found that genetic differences exert a greater influence on children’s figure drawing at age 4 than do between-family environmental differences. Figure drawing was as heritable as g at age 4 (heritability of .29 for both). Drawing scores at age 4 correlated significantly with g at age 4 (r = .33, p < .001, n = 14,050) and with g at age 14 (r = .20, p < .001, n = 4,622). The genetic correlation between drawing at age 4 and g at age 14 was .52, 95% confidence interval = [.31, .75]. Individual differences in this widespread behavior have an important genetic component and a significant genetic link with g." – h/t rosalind arden!

Differences in intelligence between ethnic minorities and Han in China

The Canadian IQ calculated from the standardization of the WAIS IV eh? — h/t emil kirkegaard (no relation)!

Genome-wide screening for DNA variants associated with reading and language traits

Differences in cognitive abilities among primates are concentrated on G: Phenotypic and phylogenetic comparisons with two meta-analytical databases“Using meta-analytic databases of ethological observations of cognitive abilities involving 69 primate species, we found that cognitive abilities that load more strongly on a common factor (which is here termed G, in line with the terminology developed in previous literature to describe aggregated measures of general intelligence) are associated with significantly bigger interspecies differences and bigger interspecies variance. Additionally, two novel evolutionary predictions were made: more G-loaded abilities would present (1) weaker phylogenetic signals, indicating less phylogenetic conservativeness, and (2) faster rates of trait evolution, as it was hypothesized that G has been subjected to stronger selection pressures than narrower, more domain-specific abilities. These predictions were corroborated with phylogenetic comparative methods, with stronger effects among catarrhines (apes and Old World monkeys) than within the entire primate order. These data strongly suggest that G is the principal locus of selection in the macroevolution of primate intelligence. Implications for the understanding of population differences in cognitive abilities among human populations and for the theory of massive modularity applied to intelligence are discussed.” – h/t erwin schmidt!

The Flynn Effect: A Meta-Analysis [pdf] – h/t jelte wicherts! who tweeted: “IQ [continues] to go up with 3 points per decade. New meta-analysis shows no evidence of diminishing Flynn Effect.”

The Elusive X-Factor, or Why Jonathan Kaplan Is Wrong about Race and IQ – @humanvarieties.

Coevolution of languages and genes“[E]volutionary processes are more complex than simple models of gene-language coevolution predict, with linguistic boundaries only occasionally functioning as barriers to gene flow. More frequently, admixture takes place irrespective of linguistic differences, but with a detectable impact of contact-induced changes in the languages concerned.” – h/t jayman!

Does Natural Law exist?“While certain notions of right and wrong can apply to all humans, much of what we call ‘morality’ will always be population-dependent. What is moral in one population may not be in another.” – from peter frost.

Morality: The Amazing Side-Taking Machine“If there are so many evolutionary pathways to nice behaviors, and if many animals are cooperative, including bees, bats, hyenas, and monkeys, then perhaps the elaborate paraphernalia of human morality — explicit rules of behavior, moral taboos, moral debates, accusations, impartiality, punishments — are not needed to make people nice. Right? This is exactly what psychological research indicates. Developmental evidence shows that children are nice to people before acquiring adult-like moral judgment. Moreover, when children develop moral judgment, it does not prevent them from taking actions they judge wrong such as lying or stealing. In adults, research shows that moral judgments differ from and can even oppose altruistic motives. Research on hypocrisy shows that people are mostly motivated to appear moral rather than to actually abide by their moral judgments. Research on ‘motivated reasoning’ shows that people deviously craft moral justifications to push their own agendas. In short, people can be nice without morality and nasty with morality — altruism and morality are independent. In fact, humans are more eager to judge other people than to follow their own moral advice. Moral condemnation of other people’s behavior is distinctly, perhaps uniquely, human. So, what is the evolutionary function of condemnation…? People can use moral judgment to assess the wrongness of fighters’ actions and then choose sides against whoever was most immoral. When all bystanders use this strategy, they all take the same side and avoid the costs of escalated fighting. That is, moral condemnation functions to synchronize people’s side-taking decisions. This moral strategy is, of course, mostly unconscious just like other evolved programs for vision, movement, language, and so on.”

The roots of human altruism“[T]he willingness to provision others varies greatly from one primate species to the next. But there was a clear pattern, as summarized by Burkart: ‘Humans and callitrichid monkeys acted highly altruistically and almost always produced the treats for the other group members. Chimpanzees, one of our closest relatives, however, only did so sporadically.’ Similarly, most other primate species, including capuchins and macaques, only rarely pulled the lever to give another group member food, if at all – even though they have considerable cognitive skills. Until now, many researchers assumed that spontaneous altruistic behavior in primates could be attributed to factors they would share with humans: advanced cognitive skills, large brains, high social tolerance, collective foraging or the presence of pair bonds or other strong social bonds. As Burkart’s new data now reveal, however, none of these factors reliably predicts whether a primate species will be spontaneously altruistic or not. Instead, another factor that sets us humans apart from the great apes appears to be responsible. Says Burkart: ‘Spontaneous, altruistic behavior is exclusively found among species where the young are not only cared for by the mother, but also other group members such as siblings, fathers, grandmothers, aunts and uncles.’ This behavior is referred to technically as the ‘cooperative breeding’ or ‘allomaternal care.'”

Feminist activist women are masculinized in terms of digit-ratio and dominance: A possible explanation for the feminist paradox“The feminist movement purports to improve conditions for women, and yet only a minority of women in modern societies self-identify as feminists. This is known as the feminist paradox…. We measured the 2D:4D digit ratios (collected from both hands) and a personality trait known as dominance (measured with the Directiveness scale) in a sample of women attending a feminist conference. The sample exhibited significantly more masculine 2D:4D and higher dominance ratings than comparison samples representative of women in general, and these variables were furthermore positively correlated for both hands. The feminist paradox might thus to some extent be explained by biological differences between women in general and the activist women who formulate the feminist agenda.”

Global genetic variations predict brain response to faces“[A] significant proportion of the brain response to facial expressions is predicted by common genetic variance in a subset of regions constituting the face network. These regions show the highest inter-individual variability in the number of connections with other network nodes, suggesting that the genetic model captures variations across the adolescent brains in co-opting these regions into the face network.” – h/t razib!

Brain, behavior and genetics“Regardless of where the science now lies, we know that biology controls behavior. Our actions and thoughts aren’t magic, they rely on the biochemistry of neurotransmitters and nerve signals. They have physical substrates that are controlled by our genes….”

The impact of neighbourhood deprivation on adolescent violent criminality and substance misuse: A longitudinal, quasi-experimental study of the total Swedish population“We found that the adverse effect of neighbourhood deprivation on adolescent violent criminality and substance misuse in Sweden was not consistent with a causal inference.” — see also Depraved on account of being deprived? from dr. james thompson.

Does Urban Living Cause Mental Illness? – h/t jayman! who tweeted: “Interview w/ @AmirSariaslan, on his work showing that adverse environments don’t cause schizophrenia, & killing GxE.”

Daughters provide as much elderly parent care as they can, sons do as little as possible — h/t frau katze!

Honor: The Cause of — and Solution to — All of Society’s Problems“Centuries-old cultural norms don’t change overnight….” — gee, i wonder why? (where does culture come from?)

Social sciences suffer from severe publication bias“Survey finds that ‘null results’ rarely see the light of the day.” – h/t claire lehmann!

Haidt: “Political Diversity Will Improve Social Psychological Science” – from steve sailer.

How Do Liberal and Conservative Attitudes About Obedience to Authority Differ? The Surprising Result of My Study“Together with my collaborators Dr. Danielle Gaucher and Nicola Schaefer, we asked both red and blue Americans to share their views about obeying liberal authorities (e.g., ‘obey an environmentalist’). In an article that we recent published in Personality and Social Psychology Bulletin, we found that liberals were now the ones calling for obedience. And when the authorities were viewed as ideologically neutral (e.g., office manager), liberals and conservatives agreed. Only when people perceived the authority to be conservative (e.g., religious authority) did conservatives show a positive bias.”

The Kennewick Man Finally Freed to Share His Secrets

Measuring Inbreeding in the Greek Gods“it seems that Ares has an inbreeding coefficient of 37.5%. This is due to the fact that his parents—Zeus and Hera—are siblings, as well as his grandparents with each other. Zeus has an inbreeding coefficient of 25%.” — (^_^)

bonus: Walking fish raised on land mimic ancient evolutionary transition

bonus bonus: Why are all our wagtails vanishing? Scientists baffled by long-term decline of three species in Britain“The three wagtail species spotted on our shores are the Yellow Wagtail, a farmland bird that migrates to sub-Saharan Africa, and two which largely remain in the UK over the winter, the Grey Wagtail, a river specialist, and the familiar Pied Wagtail. Researchers said the races of both Pied and Yellow Wagtail breeding in the UK nest almost nowhere else in the world…. Sarah Harris, BBS Organiser at the British Trust for Ornithology, said: ‘I find it fascinating that three seemingly similar birds, the Yellow, Grey and Pied Wagtail can lead such different lives and face such a variety of challenges. With the UK races of two of these species – Pied and Yellow Wagtails – being largely confined to our islands, these population changes are of global conservation significance….'” – ornithologists are soooo waaaaycist! they make me sick! (~_^)

(note: comments do not require an email. biophobia. (~_^) )

The genetics of Mexico recapitulates Native American substructure and affects biomedical traits“We studied genomic variation within Mexico from over 1000 individuals representing 20 indigenous and 11 mestizo populations. We found striking genetic stratification among indigenous populations within Mexico at varying degrees of geographic isolation. Some groups were as differentiated as Europeans are from East Asians. Pre-Columbian genetic substructure is recapitulated in the indigenous ancestry of admixed mestizo individuals across the country. Furthermore, two independently phenotyped cohorts of Mexicans and Mexican Americans showed a significant association between subcontinental ancestry and lung function. Thus, accounting for fine-scale ancestry patterns is critical for medical and population genetic studies within Mexico, in Mexican-descent populations, and likely in many other populations worldwide.” – see also: People from Mexico show stunning amount of genetic diversity“When the team analyzed the genomes of 511 indigenous individuals from all over Mexico, they found a striking amount of genetic diversity. The most divergent indigenous groups in Mexico are as different from each other as Europeans are from East Asians, they report online today in Science. This diversity maps onto the geography of Mexico itself. The farther away ethnic groups live from each other, the more different their genomes turn out to be…. But most people in Mexico or of Mexican descent these days are not indigenous but rather mestizo, meaning they have a mixture of indigenous, European, and African ancestry. Do their genomes also vary by what region of Mexico they come from, or has all that local variation been smoothed out by centuries of different groups meeting, mixing, and having babies? To answer that question, the team collaborated with Mexico’s National Institute of Genomic Medicine, which has been collecting genetic data from mestizos for many years. Somewhat surprisingly, they found that mestizos in a given part of Mexico tended to have the same ‘rare’ genetic variants as their indigenous neighbors. The mestizo genomes ‘track so well with the indigenous groups that we could use the genetic diversity in mestizos to make inferences about [their native] ancestors,’ Pasaniuc says.”

Neanderthal-Human Skulls Shed Light on Evolution“Skulls found in a Spanish cave exhibit both Neanderthal and primitive human features, according to a new study published in the journal Science. The discovery provides clues about when the common ancestor of modern humans and Neanderthals lived, what happened after the two groups diverged, and how the two became so different over a relatively short period of time. There is consensus about the ending of the story: Modern humans and Neanderthals interbred, and Neanderthal DNA is still present in people of European and Asian ancestry. But the thousands of years before they connected, however, have been a mystery.” – see also: Palaeontology: How Neanderthals evolved“A study reveals that not all distinguishing features of hominid skulls have evolved at the same pace.”

Oldest human faeces show Neanderthals ate vegetables – eat your veggies!

Searching for Answers in Very Old DNA – interview with svante paabo.

Island-hopping odyssey brought civilisation to Europe“The farmers who brought advanced civilisation to Europe got there by sailing between the many islands strewn across the Aegean Sea between Greece and Turkey, according to a new genetic analysis. The first modern humans in Europe were hunter-gatherers who arrived around 40,000 years ago. But around 9000 years ago the first farmers arrived. They spread rapidly, dominating the continent by 7500 years ago, and pushing the hunter-gatherers into decline. The farmers originated in the Fertile Crescent in the Middle East, where farming arose, but until now no one knew which route they took to get to Europe.” – see also Publication Delays from greg cochran.

The population genomic landscape of human genetic structure, admixture history and local adaptation in Peninsular Malaysia“Peninsular Malaysia has greater genetic diversity corresponding to its role as a contact zone of both early and recent human migrations in Asia. However, each single Orang Asli (indigenous) group was less diverse with a smaller effective population size (Ne) than a European or an East Asian population, indicating a substantial isolation of some duration for these groups. All four MEGs were genetically more similar to Asian populations than to other continental groups, and the divergence time between MEGs and East Asian populations (12,000—6,000 years ago) was also much shorter than that between East Asians and Europeans. Thus, Malaysian Orang Asli groups, despite their significantly different features, may share a common origin with the other Asian groups. Nevertheless, we identified traces of recent gene flow from non-Asians to MEGs. Finally, natural selection signatures were detected in a batch of genes associated with immune response, human height, skin pigmentation, hair and facial morphology and blood pressure in MEGs. Notable examples include SYN3 which is associated with human height in all Orang Asli groups, a height-related gene (PNPT1) and two blood pressure-related genes (CDH13 and PAX5) in Negritos. We conclude that a long isolation period, subsequent gene flow and local adaptations have jointly shaped the genetic architectures of MEGs, and this study provides insight into the peopling and human migration history in Southeast Asia.”

Investigating brain connectivity heritability in a twin study using diffusion imaging data – h/t jayman! who tweeted: “Surprise, surprise: diffusion imaging twin study (N = 328) finds patterns of brain connectivity are heritable.”

The stability of self-control across childhood“Results indicate that variation [76%] in self-control is predominantly genetic.”

Race a factor in mortality in heart attack patients on anti-clotting drug“The first genetic variations linked to race have been identified that begin to explain a higher risk of death among some African American and Caucasian patients taking the anti-clotting drug clopidogrel after a heart attack. In particular, the team found that two DNA variants common in African Americans were associated with an increased risk of both bleeding and death. In Caucasians, a different variant was linked to additional heart attacks and a higher risk of death.” – h/t hbd bibliography!

A common Greenlandic TBC1D4 variant confers muscle insulin resistance and type 2 diabetes

GWAS-based pathway analysis differentiates between fluid and crystallized intelligence – h/t stuart ritchie! who tweeted: “Distinction between fluid and crystallised IQ at the genetic level.”

A hair-color allele of Neanderthal origin?“60-70% of Taiwanese aborigines have a loss-of-function allele at the main hair color gene, MC1R, yet their hair is as black as humans with the original ‘African’ allele. This seems to be a general pattern in Asians. They have fewer MC1R alleles than do Europeans, and the ones they have produce the same hair color.” – from peter frost.

Physical attractiveness as a phenotypic marker of health: an assessment using a nationally representative sample of American adults“[T]he more attractive a respondent was rated, the less likely he or she was to report being diagnosed with a wide range of chronic diseases and neuropsychological disorders. Importantly, this finding was observed for both sexes. These analyses provide further support for physical attractiveness as a phenotypic marker of health.”

Mellow, Paranoid, Happy, or Mean: Why do people respond so differently to the same drugs?“Although the research hasn’t settled on simple explanations, it’s clear that some combination of personality traits, genetics, and experience affects how people respond to intoxicants.”

How universal is empathy?“Pro-social behavior seems to be a human universal, but is the same true for full empathy?” – from peter frost.

Woodley launches his Victorian defence“The Woodley gang argue that, once they have done a complete re-analysis to respond to the points raised against their original ‘Victorians’ paper, their new results ‘reveal a seemingly robust secular trend towards slowing reaction time in these two countries, which translates into a potential dysgenics rate of −1.21 IQ points per decade, or −13.9 points in total between 1889 and 2004. We conclude by arguing that the best way forward is to test novel predictions stemming from our finding relating to molecular genetics, neurophysiology and alternative cognitive indicators, thus shifting the research focus away from the purely methodological level towards the broader nomological level. We thank our critics for helping us to arrive at a much more precise estimate of the decline in general intelligence.'” – @dr. james thompson’s blog.

HVGIQ: Cambodia and HVGIQ: Turks and Caicos Islands and HVGIQ: Vietnam – from jason malloy @human varieties.

U.S. Ethnic/Race Differences in Aptitude by Generation: An Exploratory Meta-analysis – from chuck @human varieties.

Ability, Effort, and Academic Achievement among Asian Americans – from steve hsu.

andrew “the goth” sabisky on the pisa tests/scores and their implications for education.

The Flynn effect and “real intelligence”(tm) and Why a mental age of eleven and an IQ of 70 are distinct – from elijah.

Embryo selection for cognitive enhancement: curiosity or game-changer?

Power to edit who you are – on CRISPR.

Reading to Newborns Is Probably Useless – from razib.

For One Baby, Life Begins with Genome Revealed“How a California father made an end run around medicine to decode his son’s DNA.” – on razib’s boy! (^_^)

Criminal offending as part of an alternative reproductive strategy: Investigating evolutionary hypotheses using Swedish total population data“Convicted criminal offenders had more children than individuals never convicted of a criminal offense. Criminal offenders also had more reproductive partners, were less often married, more likely to get remarried if ever married, and had more often contracted a sexually transmitted disease than non-offenders. Importantly, the increased reproductive success of criminals was explained by a fertility increase from having children with several different partners. We conclude that criminality appears to be adaptive in a contemporary industrialized country, and that this association can be explained by antisocial behavior being part of an adaptive alternative reproductive strategy.” – h/t mary lou cowan! – chicks dig jerks. – see also You dropped your glove, my liege from the awesome epigone.

Men Who Hate Women – from staffan.

Why women see differently from the way men see? A review of sex differences in cognition and sports – h/t keith laws!

For The First Time, Chimpanzees Are Making A Fashion Statement — Sticking Blades Of Grass In Their Ears“It’s a trend that’s taken a troop of chimpanzees by storm: a blade of grass dangling from an ear. The “grass-in-ear behavior,” as scientists have termed it, seems to be one of the first times that chimpanzees have created a tradition with no discernible purpose — a primate fashion statement, in other words…. There’s no genetic or ecological factors, the scientists believe, that would account for this behavior — only culture.” – but, but, but…where does chimp culture come from?

Faces of Old World monkeys evolved to prevent crossbreeding

No effects of androgen receptor gene CAG and GGC repeat polymorphisms on digit ratio (2D:4D): A comprehensive meta-analysis and critical evaluation of research“In contrast to a small-sample (N=50) initial report, widely cited affirmatively in the literature, meta-analysis of the entire retrievable evidence base did not support any associations between CAG variants and right-hand, left-hand, or right-minus-left-hand 2D:4D. Effects of GGC variants on digit ratios likewise were almost exactly null.” – h/t dr. zhana!

Parents of children with autism often have autistic traits – kid has all his ducks in a row! (~_^) – h/t jason moore!

Sensitive? Emotional? Empathetic? It could be in your genes“Do you jump to help the less fortunate or cry during sad movie scenes? If yes, you may be among the 20 percent of our population that is genetically pre-disposed to empathy, according to a study. The results provide further evidence that highly sensitive people are generally highly tuned into their environment, and provide evidence that especially high levels of awareness and emotional responsiveness are fundamental features of humans characterized as HSPs.” – h/t mr. robert ford!

Negotiating the gap: Four academics and the dilemma of human biodiversity – from peter frost.

Guns & Violence, Again – from jayman.

The Little Divergence“A ‘great divergence’ between the economies of Western Europe and East Asia had unambiguously occurred by 1800. However, there’s a growing body of opinion that this was preceded by a ‘little divergence’ which might have started as early as 1200. I argue that the pre-modern ‘little divergence’ was probably real, but that doesn’t mean it happened because of a modern growth process — a sustained rise in the production efficiency of the divergent economies. The ‘little divergence’ might be only a reflexion of those societies’ Malthusian balance of natality and mortality.” – from pseudo. – see also Addendum to The Little Divergence.

Searching for the “Free Will” Neuron“Gabriel Kreiman’s single-neuron measurements of unconscious decision-making may not topple Descartes, but they could someday point to ways we can learn to control ourselves.”

Denying the Tribe – from claire lehmann.

Mike Lotus Meeting with Emmanuel Todd in Paris, Discussing Todd’s Current Work and America 3.0“Todd spoke about the origins of the Absolute Nuclear Family, as contrasted with the Community Family which predominates in much of Eurasia. Todd said that his most recent book, ‘L’Origine des systemes familiaux’ he shows that the entire history of the world is understood backward. Specifically, the supposedly most backward places are the most advanced. He told me that he had made an absurd mistake in his early book The Explanation of Ideology: Family Structure and Social Systems. He said in Explanation that the distribution of family systems appeared to be random. But, he said, he should have realized that this could not be correct. He took out a pile of printer paper and with rapid strokes sketched an oval and filled in the center, noting that this was the community family area. It was a given that I understood that the oval was Eurasia. He then marked Xs around the periphery for England, Iceland, Finland, France, Japan, Korea, the Philippines all areas which were still individualistic in family structure. He said the book articulates the ‘Principle of Peripheral Conservation.’ The oldest known family structure is the Undifferentiated Nuclear Family (UNF). In England the UNF evolved into the ANF over many centuries. The Community Family forms took four to five thousand years to form and to reach their current state of development. In particular the subjugation of women took a very long time to complete in these systems. In other words, the societies which are currently considered the most modern have as a foundation an archaic family structure.” – h/t t.greer!

A Dozen Words for Misunderstood“Slaying, yet again, the idea that the languages we speak shape the thoughts we think.” – h/t steve stewart williams!

Understanding current causes of women’s underrepresentation in science“[D]ifferential gendered outcomes in the real world result from differences in resources attributable to choices, whether free or constrained, and that such choices could be influenced and better informed through education if resources were so directed. Thus, the ongoing focus on sex discrimination in reviewing, interviewing, and hiring represents costly, misplaced effort: Society is engaged in the present in solving problems of the past, rather than in addressing meaningful limitations deterring women’s participation in science, technology, engineering, and mathematics careers today.”

Breaking the Glass Ceiling? The Effect of Board Quotas on Female Labor Market Outcomes in Norway [pdf] – h/t ben southwood! who tweeted: “Norwegian gender quotas on boards had ‘very little discernible impact on women in business beyond its direct effect.'”

Archaeological cave dig unearths artefacts from 45,000 years ago“An archeological dig has revealed artefacts of early occupation so old they rival the dates of those found at sites of the earliest human settlement in Australia. The discovery of the artefacts of animal bone and charcoal at the Ganga Maya Cave (named by traditional owners meaning ‘house on the hill’) in the Pilbara region of Western Australia are the subject of a scientific paper not yet submitted to archaeological journals.”

Artificial cranial modification in Kow Swamp and Cohuna“This project provides added support for the argument that at least some Pleistocene Australian groups were practicing artificial cranial modification.” – h/t neuroskeptic!

Researchers discover 6,200-year-old schistosomiasis parasite egg“Researchers have discovered what they believe is the oldest ever schistosomiasis parasite egg in a 6,200-year-old grave by the Euphrates river in Syria, potentially providing the first evidence that Middle East agricultural irrigation systems – the artificial application of water to land or soil – may have contributed to the schistosomiasis burden.” – d*mn agriculture! – h/t adam benton @evoanth!

Tablet about payment of donkey debt discovered in Kültepe believed to be oldest trade document – h/t frau katze!

bonus: Assessment of Genetic Variability of Fish Personality Traits using Rainbow Trout Isogenic Lines“The study of inter-individual variability of personality in fish is a growing field of interest but the genetic basis of this complex trait is still poorly investigated due to the difficulty in controlling fish genetic origin and life history…. To this end, seven to ten rainbow trout isogenic lines were screened for their spatial exploratory behaviour, their flight response toward a stressor and their risk taking behaviour. Results showed that some lines seemed less sensitive to new events or environmental changes and could be defined as low responsive, while others were very sensitive and defined as high responsive.” – h/t justin tiehen!

bonus bonus: Meet one of your ancestors: a 505-million-year-old fish

bonus bonus bonus: H. pylori Bacteria Frantically Mutate to Establish Infection“A burst of rapid evolution allows Helicobacter pylori, the bacterium that causes ulcers in humans, to evade the immune system during the early, acute phase of infection. This finding complements earlier work that quantified how quickly H. pylori mutations accumulate during chronic infection. During the acute phase, mutational rates are 30 to 50 times greater than during the chronic phase.”

bonus bonus bonus bonus: An 81 million year herpes infection: First endogenous herpes virus found!

bonus bonus bonus bonus bonus: Scientific proof that dogs don’t like bananas

(note: comments do not require an email. social construct duck vs. social construct duck!)

Crickets in two places fall silent to survive“To hide themselves from deadly flies, crickets on two Hawaiian islands have evolved an inability to sing. Ten years ago, two years apart, males appeared on Kauai and Oahu with altered wings, which they would normally rub together to chirp and attract females. New findings published in the journal Current Biology show that the wing changes are physically different and arose from separate mutations. This makes the silent crickets a brand new example of ‘convergent evolution’.” – and some really rapid evolution!

Microbes May Drive Evolution of New Animal Species“[S]ymbiosis — a long-term, stable and often beneficial interaction between organisms — could drive two populations apart, the first step in the development of new species. Although the idea has been floating around for nearly a century, it has only recently begun to gain traction in biology. This idea contrasts sharply with the traditional picture of evolution, in which new species emerge either from geological isolation or from a relentless struggle for food and mates. According to this new hypothesis, a host organism’s microbes might trigger changes in mating and reproduction that begin to define two different populations.” – h/t charles!

you gotta read this!: Coincidental Killers“We assume that microbes evolved to attack humans when actually we are just civilian casualties in a much older war…. Many of the pathogens we fear most are mere tourists on the human body. Their real homes are oceans, caves, or soils. To understand them, we need to understand them within their natural ecology. Soil, for example, is an extreme habitat for a microbe: harsh and constantly changing. It can quickly oscillate from flood to drought, from scalding heat to freezing cold, and total darkness to intense solar radiation. It’s rife with other competing microbes, and crawling with hungry predators. We fear lions and tigers and bears; bacteria have to contend with phage viruses, nematode worms, and predatory amoebas. All of these conditions can lead to adaptations that make microbes accidentally suited for life in a human host. We are, after all, just another environment. A thick capsule that shields a microbe from dehydration could also shield it from our immune system. A spore that is adapted for travelling through the air can be easily inhaled into a respiratory tract.”

Genetically identical ants help unlock the secrets of larval fate“A young animal’s genes are not the only genes that determine its fate. The genetic identity of its caretakers matters too…. [A] team led by Serafino Teseo of the University of Paris 13 used the unique aspects of the [clonal] ants’ biology to test the indirect role genes play in shaping the future identity of larvae and whole colonies by looking at the interaction between larvae and adults. They did so by observing the success of two ant clones, A and B, in pure colonies or mixed together into chimeric colonies. They also swapped broods, so A adults raised B larvae and vice versa. It turned out that A and B larvae developed differently depending on whether A or B nurses raised them. Left alone, pure A colonies produced the most young after six generations, making them more successful than B. However, in mixed colonies, B did better because its larvae more frequently turned into large adults that specialize in egg-laying rather than smaller, foraging-focused individuals….” – h/t rolf muertter!

Mitochondrial DNA of first Near Eastern farmers is sequenced for the first time“According to conclusions, genetic affinities have been observed between the mitochondrial DNA of first Neolithic populations and the DNA of first Catalan and German farmers. This suggests that probably Neolithic expansion took place through pioneer migrations of small groups of population. Moreover, the two main migration routes — Mediterranean and European — might have been genetically linked. ‘The most significant conclusion — highlights Eva Fernández — is that the degree of genetic similarity between the populations of the Fertile Crescent and the ones of Cyprus an Crete supports the hypothesis that Neolithic spread in Europe took place through pioneer seafaring colonization, not through a land-mediated expansion through Anatolia, as it was thought until now….’ Other scientific studies had already provided signs of an alternative scenario of Neolithic spread in Europe different from the one through Anatolia. According to Turbón, ‘recent archaeological finds have proved that the Neolithic arrived to Cyprus around 10,600 years ago, some years after the first documentation of agricultural practices in the Near East.’ Architecture and burial models found in Cyprus’ sites are similar to the ones found in the Middle Euphrates basin, ‘that indicates a direct colonisation of these territories,’ highlights the author. ‘Besides, spatial interpolation of radiocarbon dates from different Neolithic sites in the Near East and Europe also suggests a first seafaring expansion through Cyprus,’ he concludes.” – orginal research article.

The Giant Rat of Sumatra and Sardinia and No True Sardinian – from greg cochran.

A twist in Austronesian origins“The Taiwanese origin of Austronesians is widely accepted. A new preprint confirms this theory, but adds a new twist to the story of Austronesian dispersals, as it seems that in their western expansion, Austronesians picked up some Austroasiatic ancestry. This means either that Austroasiatic speakers preceded them in islands where Austronesian languages are now spoken, or that the Austronesians picked up this kind of ancestry in the mainland before settling in the islands.” – from dienekes.

A new allele for blond hair“There is a widespread belief that whatever made Europeans fair-skinned also gave them their unique palette of hair and eye colors. In reality, fair skin has only a weak genetic linkage with either non-black hair or non-brown eyes.” – from peter frost. see also: A molecular basis for classic blond hair color in Europeans.

A Genetic Map of Fireworks in Time“French Canadians and Slavs are both cases of populations which were once relatively modest and began in a narrow delimited region, but now are quite expansive and numerous. In the case of the East Slavs the demographic expansion also entailed the absorption of numerous Uralic tribes, as well as later Turks. And this illustrates one of the major details which I think has characterized the genetic turnover of human populations: phase shifts from a relatively static one defined by isolation by distance gene flow across clinal gradiants, to a rapid expansion of a small subset, and the overlay of this component as a palimpsest over the underlying variation. In some cases the replacement is nearly total, as in the modern United States. In other cases, as among Great Russians, the Slavic affinities of this population, and its association with Poles and other groups are clear, but there was a non-trivial uptake of exogenous segments which might allow for a reconstruction of the prior genetic landscape. These changes occur over short periods, and are bright fireworks against the comparatively static firmament.” – from razib.

Male faces ‘buttressed against punches’ by evolution“A new theory suggests that our male ancestors evolved beefy facial features as a defence against fist fights. The bones most commonly broken in human punch-ups also gained the most strength in early “hominin” evolution. They are also the bones that show most divergence between males and females.” – h/t darwin evolution! – original research article.

Faster eye responses in Chinese people not down to culture“New research from University of Liverpool scientists has cast doubt on the theory that neurological behaviour is a product of culture in people of Chinese origin. Scientists tested three groups – students from mainland China, British people with Chinese parents and white British people – to see how quickly their eyes reacted to dots appearing in the periphery of their vision…. The findings, published in the journal PLoS One, revealed that similar numbers of the British Chinese and mainland Chinese participants made high numbers express saccades, with the white British participants made far fewer. Culturally the British Chinese participants were similar to their white British counterparts and different to the mainland Chinese students.”

Cultural differences in human brain activity: A quantitative meta-analysis“East Asians show enhanced activity underlying mentalizing and emotion regulation. Westerners show enhanced activity underlying self-reflection and emotional responses.”

Race could be a factor in head, neck cancer survival rates“The national survival rates for African-Americans diagnosed with head and neck cancer have not improved in the last 40 years despite advances in the treatment and management of the disease, researchers have found. The researchers suggest that inherent genetic factors in African-Americans may make some tumors resistant to treatments.”

Severe intellectual disability diagnosed by analysis of entire genome“[A]lmost all mental impairments are caused by new mutations that have not yet occurred in father or mother.” – h/t mr. robert ford!

New genes involved in food preferences will revolutionize diets and improve health“The researchers undertook genome wide association studies (GWAS) to try to unravel the genetic basis for certain food preferences. 2311 Italian subjects participated in the discovery step, while 1755 from other European countries and from Central Asia were used in order to further verify the findings. They uncovered 17 independent genes related to liking for certain foods, including artichokes, bacon, coffee, chicory, dark chocolate, blue cheese, ice cream, liver, oil or butter on bread, orange juice, plain yoghurt, white wine and mushrooms. Surprisingly, none of the genes thus identified belonged to the category of taste or smell receptors…. In a second study, the researchers amassed the response of around 900 healthy adults from North Eastern Italy to salt, and related this to a DNA sequence variation found on the KCNA5 gene, known to be related to taste pathways in mammals.”

First direct evidence for human sex pheromones“‘By using dynamic point-light displays that portray the gaits of walkers whose gender is digitally morphed from male to female, we show that smelling androstadienone systematically biases heterosexual females, but not males, toward perceiving the walkers as more masculine. By contrast, smelling estratetraenol systematically biases heterosexual males, but not females, toward perceiving the walkers as more feminine. Homosexual males exhibit a response pattern akin to that of heterosexual females, whereas bisexual or homosexual females fall in between heterosexual males and females. These effects are obtained despite that the olfactory stimuli are not explicitly discriminable. The results provide the first direct evidence that the two human steroids communicate opposite gender information that is differentially effective to the two sex groups based on their sexual orientation.'” – @deric bownds’ mindblog.

Genetic relatedness predicts contact frequencies with siblings, nieces and nephews: Results from the Generational Transmissions in Finland surveys“Individuals have more contacts with full than with half siblings. Individuals have more contacts with nieces/nephews via full than via half siblings. Individuals have more contacts with nieces/nephews via sisters than via brothers.” – h/t jayman!

Beware Armchair Psychoanalysis“‘Behavioral genetic studies have proved beyond a shadow of a doubt that heredity is responsible for a sizable portion of the variations in people’s personalities. Some people are more hot-tempered or outgoing or meticulous than others, and these variations are a function of the genes they were born with as well as the experiences they had after they were born. The exact proportion— how much is due to the genes, how much to the experiences—is not important; the point is that heredity cannot be ignored.'” – from jayman (quoting judith rich harris there).

SD-IE and other differentiation effects in Italy and Spain [pdf] – “SD–IE [strategic differentiation–integration effort] is a strategic differentiation effect present amongst indices of life history (LH), such that persons and populations of slow LH are more differentiated compared to those of fast LH. We found that this phenomenon is present amongst provinces in Italy and Spain, similarly to demonstrations among US states and Japanese prefectures. The average effect size of SD–IE was found to be bigger in Spain and Italy….. In the present study, we test SD–IE using regional-level data for counties in Spain and Italy.”

Is the smart fraction as valuable as previously thought?“‘Consistent with the intellectual class theory advocated by Rindermann and Thompson (2011) and Rindermann et al. (2009), our research findings showed strong evidence that those people that have high IQ are the most relevant influence on economic development. Although our results suggested that all three examined IQ categories promote higher economic growth, the intellectual class has the highest impact followed by the mean ability and non-intellectual classifications. Similarly, the intellectual class also has a highly significant effect on generating technological progress, whereas the influence of the other two groups is immaterial.'” – @dr. james thompson’s blog.

HVGIQ: Burma and HVGIQ: U.S. Virgin Islands – from jason malloy.

Life unworthy of life – post about, as jayman put it, who supports eugenics. – from the awesome epigone.

The Biology of Risk“The state of your body predicts your appetite for financial risk just as it predicts an athlete’s performance. If we understand how a person’s body influences risk taking, we can learn how to better manage risk takers. We can also recognize that mistakes governments have made have contributed to excessive risk taking.”

We can’t ignore the evidence: genes affect social mobility“Why do so many people fail to accept the overwhelming evidence that genes contribute to academic achievement and thereby social status?” – h/t hbd bibliography!

India’s Feudal Rapists

Old chaps? 3,300-year-old trousers found in China may be world’s oldest“Animal-fur menswear found on the bodies of two mummies in Xinjiang province ‘almost the same shape as today’s trousers'”

Grave find may be Western Europe’s earliest false tooth“Archaeologists have identified what could be remains of the earliest false tooth found in Western Europe. The dental implant comes from the richly-furnished timber burial chamber of an Iron Age woman that was excavated in Le Chene, northern France.”

Cat People Are Smarter Than Dog People, New Study Shows – (~_^) – ftr, i like both. i’m not a speciesist!

bonus: Blind cavefish are able to ‘count’“Blind cave-dwelling fish are able to discriminate between different quantities, scientists say…. Researchers say it is the first time non-visual numerical abilities have been shown in fish.” – h/t mo costandi!

bonus bonus: Bees build mental maps to get home“Study suggests the insects do not rely solely on the Sun as a compass…. ‘The surprise comes for many people that such a tiny little brain is able to form such a rich memory described as a cognitive map,’ says co-author Randolf Menzel, a neurobiologist at the Free University of Berlin.”

bonus bonus bonus: Nemo’s Dad Should Have Become His Mom, And Other Lies Children’s Movies Told You – h/t steve stewart williams!

(note: comments do not require an email. “i wandered lonely as a cloud….”)

Quick Questions for Peter and Rosemary Grant“There is widespread misunderstanding about evolution; that it occurs extremely slowly and therefore cannot be studied in a person’s lifetime. This was the view of Charles Darwin. Many biologists and others now know that this is not correct…. The idea that animals as large as birds might evolve before our eyes is not so well known, yet our study in the entirely natural world of Daphne Major island has revealed this does in fact happen when there is a change in the environment, and it takes place over a period as short as a year, and repeatedly.” – h/t billare!

Is DNA Multilingual?“The genetic code has traditionally been viewed as a universal set of instructions, exquisitely tuned to maintain robust stability and allow evolution-sustaining mutations. But the pervasive occurrence of recoded stop codons, and the backchannel crosstalk between microbes and viruses, paints a more intricate picture of multilingual genetic instructions.”

Jelly genome mystery“The uniqueness of this ctenophore’s nervous system leads Moroz and his team to argue that it must have evolved independently, after the ctenophore lineage branched off from other animals some 500 million years ago.”

Genomic divergence in a ring species complex“Ring species provide particularly clear demonstrations of how one species can gradually evolve into two, but are rare in nature…. Here we use genome-wide analyses to show that, although spatial patterns of genetic variation are currently mostly as expected of a ring species, historical breaks in gene flow have existed at more than one location around the ring, and the two Siberian forms have occasionally interbred.” – h/t razib!

Natural selection and infectious disease in human populations“The ancient biological ‘arms race’ between microbial pathogens and humans has shaped genetic variation in modern populations, and this has important implications for the growing field of medical genomics. As humans migrated throughout the world, populations encountered distinct pathogens, and natural selection increased the prevalence of alleles that are advantageous in the new ecosystems in both host and pathogens. This ancient history now influences human infectious disease susceptibility and microbiome homeostasis, and contributes to common diseases that show geographical disparities, such as autoimmune and metabolic disorders.”

High genetic differentiation between populations often driven by classic selective sweeps“‘We demonstrate that while sites of low differentiation represent sampling effects rather than balancing selection, sites showing extremely high population differentiation are enriched for positive selection events and that one half may be the result of classic selective sweeps. Among these, we rediscover known examples, where we actually identify the established functional SNP, and discover novel examples including the genes ABCA12, CALD1 and ZNF804, which we speculate may be linked to adaptations in skin, calcium metabolism and defense, respectively. Conclusions: We have identified known and many novel candidate regions for geographically restricted positive selection, and suggest several directions for further research.'” – @dienekes’.

Mendelian-Mutationism: The Forgotten Evolutionary Synthesis – h/t neuroskeptic! who tweeted: “Did geneticists ‘crack’ the secret of evolution much earlier than believed?”

this one’s for linton!: Why Marrying Your Cousin May Pay Off“In line with previous findings, the researchers found that among non-foraging societies, a couple’s relatedness was linked with having more surviving children. But among foraging societies, the opposite was true: More-closely related spouses had fewer surviving children. Furthermore, the more family intermarriage in a society, the greater the benefit of intermarrying on the number of children couples had. In other words, in societies in which people frequently married their relatives, intermarrying showed a stronger link to having more children.”

The Closest of Strangers“[I]dentical twins who are aunts and uncles invest more in caring for the children of their twins (their ‘genetic’ sons and daughters) than do fraternal twins.”

Why Do Honor Killings Defy the First Law of Homicide? And Will Smaller Families Lead to Fewer Of Them? – h/t tom farsides! – previously: inclusive inclusive fitness.

Genetic and educational assortative mating among US adults“We find that spouses are more genetically similar than two individuals chosen at random but this similarity is at most one-third the magnitude of educational similarity.”

Irish fair skin can be traced to India and the Middle East“A major new US study at Penn State University has found that Europeans’ light skin stems from a gene mutation from a single person who lived 10,000 years ago…. Keith Cheng from Penn State College of Medicine reported that one amino acid difference in the gene SLC24A5 is a key contributor to the skin color difference between Europeans and West Africans…. ‘The mutation in SLC24A5 changes just one building block in the protein, and contributes about a third of the visually striking differences in skin tone between peoples of African and European ancestry, he said…. The mutation, called A111T, is found in virtually everyone of European ancestry. A111T is also found in populations in the Middle East and Indian subcontinent, but not in high numbers in Africans. All individuals from the Middle East, North Africa, East Africa and South India who carry the A111T mutation share traces of the ancestral genetic code. According to the researchers, this indicates that all existing instances of this mutation originate from the same person.” – h/t 23andMe!

The puzzle of European hair, eye, and skin color“The physical appearance of Europeans seems to result from a selection pressure that acted primarily on women and only secondarily on men. This is especially true for highly visible traits on or near the face—the focus of visual attention.” – from peter frost.

The Dark Triad of Personality – special issue of Personality and Individual Differences. – h/t claire lehmann!

Heritability of brain volume change and its relation to intelligence“Human brain volumes change throughout life, are highly heritable, and have been associated with general cognitive functioning…. Results show that changes in volumes of total brain (mean=-6.4ml; -0.5% loss), cerebellum (1.4ml, 1.0% increase), cerebral white matter (4.4ml, 0.9% increase), lateral ventricles (0.6ml; 4.8% increase) and in surface area (-19.7cm2, -1.1% contraction) are heritable (h2=43%; 52%; 29%; 31%; and 33%, respectively). An association between IQ (available for 91 participants) and brain volume change was observed, which was attributed to genes involved in both the variation in change in brain volume and in intelligence. Thus, dynamic changes in brain structure are heritable and may have cognitive significance in adulthood.”

Cognitive abilities amongst the Sámi population“Lapps have an IQ around 100.8 are tilted towards visuospatial ability and away from verbal ability.” – from elijah armstrong, michael woodley the younger, and richard lynn. edit: original paper here on elijah’s blog! (^_^)

The Flynn Effect in a Nutshell – from elijah.

Does brain structure determine your political views?“‘People like to believe that their own political beliefs are rational, that they’re a sensible response to the world around them, so when we come along and say, “Maybe there are these predispositions, influential but perhaps not fully in your conscious awareness,” that’s not the way we like to view our own political beliefs.'” – h/t mr. robert ford!

Sex-Related Neuroanatomical Basis of Emotion Regulation Ability“Behavioral research has demonstrated that males have a higher capability of regulating their own and others’ emotions than females; however, little is known about the sex-specific brain mechanisms involved in emotion regulation ability…. we found the sex differences in the neuroanatomical basis of emotion regulation ability. Males showed a stronger positive relation between emotion regulation ability and regional gray matter volume (rGMV) in the right dorsolateral prefrontal cortex. In contrast, females demonstrated a stronger positive relation between emotion regulation ability and rGMV in an anatomical cluster that extends from the left brainstem to the left hippocampus, the left amygdala and the insular cortex.”

More Maps of the American Nations – from jayman.

Privilege and Morality“Our species isn’t good at nuance. The ‘privilege’ debate will and must take place in a morally charged context. It is not possible to sanitize the discussion by scrubbing it free of moral emotions. That is one of the many reasons why it is so important to understand what morality is and why it exists. It does not exist as a transcendental entity that happened to pop into existence with the big bang, nor does it exist because the Big Man upstairs wants it that way. It exists because it evolved.” – from helian.

Economic Growth & Human Biodiversity“Economic growth in lower-IQ countries does not invalidate either the reality of IQ differences between countries or the persistence of those disparities.” – from pseudoerasmus.

Good Fences: The Importance of Setting Boundaries for Peaceful Coexistence“Switzerland is recognized as a country of peace, stability and prosperity. This is surprising because of its linguistic and religious diversity that in other parts of the world lead to conflict and violence. Here we analyze how peaceful stability is maintained. Our analysis shows that peace does not depend on integrated coexistence, but rather on well defined topographical and political boundaries separating groups, allowing for partial autonomy within a single country. In Switzerland, mountains and lakes are an important part of the boundaries between sharply defined linguistic areas. Political canton and circle (sub-canton) boundaries often separate religious groups. Where such boundaries do not appear to be sufficient, we find that specific aspects of the population distribution guarantee either sufficient separation or sufficient mixing to inhibit intergroup violence according to the quantitative theory of conflict. In exactly one region, a porous mountain range does not adequately separate linguistic groups and that region has experienced significant violent conflict, leading to the recent creation of the canton of Jura.”

Was Territoriality Important in the Pleistocene? A Commentary on Johnson and Toft – @peter turchin’s.

Southern Europe is suspicious: the evolution of trust in the EU – ess and wvs results.

Trust and In-Group Favoritism in a Culture of Crime [pdf] – h/t ben southwood! who tweeted: “Areas in Palermo with high Mafia involvement have lower generalised trust but higher in-group favouritism.”

In dogs’ play, researchers see honesty and deceit, perhaps something like morality – woof!

What is Phonemic Diversity? — And Does It Prove the Out-of-Africa Theory? – h/t james winters!

How a Protestant spin machine hid the truth about the English Reformation“It seems that in 1533, the year of Henry’s break from Rome, traditional Catholicism was the religion of the vast majority of the country. And in most places it was absolutely thriving. It had developed a particularly English flavour, with a focus on the involvement of ordinary people in parish churches, village greens, plays, and pageants – much of which seemed to involve a good deal of community parties, dancing, and drinking. It is true that English religion in the early 1500s was not especially studious or erudite. The people did not spend hours a day in biblical studies, contemplation, and moralising in the manner of the more intense European reformers. But England had a nationally cohesive spirituality that was alive and exuberant, with a distinctly community feel…. The conclusion of this modern grassroots scholarship is that bulldozing the Catholic Church off the face of medieval England was not a ‘bottom up’ revolution in which Henry merely acquiesced to his people’s wishes by throwing off a widely hated foreign domination. To the contrary, it looks increasingly like Henry and his circle imposed the Reformation ‘top down’, unleashing 100 years of deep anger and alienation that was only overcome by sustained politicking and ruthless force.” – h/t william briggs!

bonus: “No Oxygen? No Problem!” Says Squid That Can Shut Down Its Metabolism – h/t kyle hill!

bonus bonus: A Theory on How Flightless Birds Spread Across the World: They Flew There

bonus bonus bonus: Chicken project gets off the ground“Effort aims to unravel the history of bird’s domestication.” – cluck!

(note: comments do not require an email. humble humboldt squid!)

i know it seems as though your hbd chick has been slacking off this past week — which, given my low scores for conscientiousness, would not have been a bad guess on your part — but i have in fact been trying to become more intelligent via osmosis (the only way it’s going to happen at this point) by hanging out at the london conference on intelligence 2014. (^_^)

don’t know if my clever plan has worked or not, but i can at least point you to the summaries of a couple of the presentations that dr. thompson has posted on his blog. yes, he has promised to put them all up there!:

- Increasing simple reaction times demostrate decreasing genetic intelligence in Scotland and Sweden

- The General Factor of Personality

Svante Paabo talk at NIH“According to Dr. Paabo, Ust-Ishim has longer Neandertal chunks than modern humans and this can be used to estimate that the admixture with Neandertals happened 331+/-99 generations before its time of 45,000y BP, or around 50-60,000y BP…. This pretty much proves that there were modern humans in Eurasia before the Upper Paleolithic revolution and disproves Richard Klein’s theory that modern humans together with UP technologies spread Out-of-Africa only after 50,000 years ago.” – from dienekes.

Europeans have three times more Neanderthal genes for lipid catabolism than Asians or Africans“Contemporary Europeans have as many as three times more Neanderthal variants in genes involved in lipid catabolism than Asians and Africans. Although Neanderthals are extinct, fragments of their genomes persist in modern humans. These shared regions are unevenly distributed across the genome and some regions are particularly enriched with Neanderthal variants.”

The really old Europe is mostly in Eastern Europe“‘These results confirm Sardinia as a refuge area where ancestry related to Early European Farmers has been best preserved, and also the greater persistence of WHG-related ancestry in present-day Eastern European populations. The latter finding suggests that West European Hunter-Gatherers (so-named because of the prevalence of Loschbour and La Braña) or populations related to them have contributed to the ancestry of present-day Eastern European groups.'” – @eurogenes blog.

More on Deafness“Seems to me that limited verbal stimulation is not a very plausible primary cause of low test scores and low academic achievement in blacks, because the degree of deprivation needed to cause a 1-standard deviation decline is extreme (deafness), and because there is an even greater depression of nonverbal scores, which, judging from the results in deaf children, should not be affected at all by limited verbal stimulation.” – from greg cochran.

Language structure: You’re born with it“Humans are unique in their ability to acquire language. But how? A new study shows that we are in fact born with the basic fundamental knowledge of language, thus shedding light on the age-old linguistic ‘nature vs. nurture’ debate.”

Selection for complex traits leaves little or no classic signatures of selection“We present empirical evidence to suggests little discernible ‘selection signature’ for complex traits in the genome of dairy cattle despite very strong and recent artificial selection.” – h/t razib!

Whole genome sequencing of six dog breeds from continuous altitudes reveals adaption to high-altitude hypoxia“To understand the genetic bases of adaption to high altitude in dogs, we performed whole-genome sequencing of 60 dogs including five breeds living at continuous altitudes along the Tibetan plateau from 800 to 5,100 m as well as one European breed…. Comparison of the breeds from different altitudes reveals strong signals of population differentiation at the locus of hypoxia-related genes including endothelial Per-Arnt-Sim (PAS) domain protein 1 (EPAS1) and beta hemoglobin cluster. Especially, four novel non-synonymous mutations specific to high-altitude dogs are identified at EPAS1, one of which occurred at a quite conserved site in the PAS domain. The association testing between EPAS1 genotypes and blood-related phenotypes on additional high-altitude dogs reveals that the homozygous mutation is associated with the decreased blood flow resistance, which may help to improve hemorheologic fitness. Interestingly, EPAS1 was also identified as a selective target in Tibetan highlanders, though no amino acid changes were found. Thus, our results not only indicate parallel evolution of humans and dogs in adaption to high-altitude hypoxia, but also provide a new opportunity to study the role of EPAS1 in the adaptive processes.” – h/t joe pickerell!

Facial Width-To-Height Ratio Relates to Alpha Status and Assertive Personality in Capuchin Monkeys“fWHR was positively associated with alpha status and with a dimensional rating of assertive personality in both males and females. Moreover, fWHR showed significant sexual dimorphism in adults but not juveniles, suggesting a developmental change may occur during puberty. In a sub-sample, sex differences were mediated by weight, suggesting fWHR dimorphism does not exceed what would be expected by differences in body weight. This is the first report of an association between face shape and behaviour in a non-human species.” – h/t stuart ritchie!

The relationship between Microcephalin, ASPM and intelligence: A reconsideration“Microcephalin is strongly associated with DNA repair, which indicates a special role for this allele in the intrinsic anti-viral immune response. Enhanced immune functioning may have advantaged both hunter–gatherer and agrarian societies coping with the heightened disease burden that resulted from population growth and exposure to zoonotic diseases, making it more likely that such growth and concomitant increases in intelligence could occur.” – from michael woodley et al. – see also The riddle of Microcephalin – from peter frost.

Caucasian Boys Show Highest Prevalence of Color Blindness Among Preschoolers“The first major study of color blindness in a multi-ethnic group of preschoolers has uncovered that Caucasian male children have the highest prevalence among four major ethnicities, with 1 in 20 testing color blind. Researchers also found that color blindness, or color vision deficiency, in boys is lowest in African-Americans, and confirmed that girls have a much lower prevalence of color blindness than boys.”

Humans and saber-toothed tiger met in Germany 300,000 years ago

One of the Key Characteristics of Ancient DNA, Low Copy Number, May be a Product of its Extraction – h/t hbd bibliography!

Give it up, Psmithe – steve sailer on greg clark’s The Son Also Rises.

Why I am now skeptical of the hypothesis that dysgenics has had substantial real-world effects – elijah (doin’ his superman thing (~_^) ).

El capital humano de las naciones: ¿Más allá de PISA? – h/t billare! who tweeted: “Take Lynn & Vanhanen’s 2012 estimates, correlate them to PISA math & science results, find an r of 0.98.”

The grasping reflex of babies: a vestigial trait? – from jerry coyne.

Social influence constrained by the heritability of attitudes – h/t andrew sabisky! who tweeted: “more heritable attitudes are more resistant to social pressure.”

What Are Relatives Good For?“The battle over every aunt and uncle’s favorite evolutionary theory.”

Genetic Influences Are Virtually Absent for Trust“Here we examine a population-based sample of 1,012 twins and relatives. We show that the genetic influence on generalized trust in other people (trust-in-others: h2 = 5%, ns), and beliefs regarding other people’s trust in the self (trust-in-self: h2 = 13%, ns), is virtually absent…. We show that, relative to cognitive abilities, psychiatric disorders, and classic personality variables, genetic influences are smaller for trust, and propose that experiences with or observations of the behavior of other people shape trust more strongly than other traits.” – h/t rene bekkers!

Psychopaths: how can you spot one?“But is psychopathy a disorder – or a different way of being…? If someone’s brain lacks the moral niceties the rest of us take for granted, they obviously can’t do anything about that, any more than a colour-blind person can start seeing colour. So where does this leave the concept of moral responsibility? ‘The legal system traditionally asserts that all people standing in front of the judge’s bench are equal. That’s demonstrably false,’ says the neuroscientist David Eagleman, author of Incognito: The Secret Lives of the Brain. He suggests that instead of thinking in terms of blameworthiness, the law should deal with the likelihood that someone will reoffend, and issue sentences accordingly, with rehabilitation for those likely to benefit and long sentences for those likely to be long-term dangers.” – h/t (heh! (~_^) ) heartiste!

IQ, Neuroticism, booze, and those damn vegetables again – from dr. james thompson.

Tweet of the Week“‘[H]umans are very good at attributing causality when it does not exist. That has led to confusion between correlation and cause on an industrial scale, not least in attempts to work out the effects of diet on health.'” – @jayman’s.

Is there a gene for procrastination? – there’d better be or else i’m all outta excuses! (*^_^*) see also: Genetic Relations Among Procrastination, Impulsivity, and Goal-Management Ability – Implications for the Evolutionary Origin of Procrastination.

Biological evidence of positive and negative people in the world“The ability to stay positive when times get tough — and, conversely, of being negative — may be hardwired in the brain, finds new research.”

“Grounds of War” – A New Paper on Territoriality with Remarkable “Similarities” to the Work of Robert Ardrey – from helian.

Equal ≠ The Same: Sex Differences in the Human Brain“At the root of the resistance to sex-influences research, especially regarding the human brain, is a deeply ingrained, implicit, false assumption that if men and women are equal, then men and women must be the same. This is false. The truth is that of course men and women are equal (all human beings are equal), but this does not mean that they are, on average, the same. 2 + 3 = 10 – 5, but these expressions are not the same. And, in fact, if two groups really are different on average in some respect, but they are being treated the same, then they are not being treated equally on average.”

Inbreeding is associated with lower 2D: 4D digit ratio. – in turkey. meanwhile, classic post from heartiste: Is Finger Length Ratio Evidence Of A Woman’s Fidelity?

diana fleischman speculates on that “perceived intelligence of faces” research that came out recently.

Thinking about a majority-minority shift leads to more conservative views“Facing the prospect of racial minority groups becoming the overall majority in the United States leads White Americans to lean more toward the conservative end of the political spectrum, according to research. The findings suggest that increased diversity in the United States could actually lead to a wider partisan divide, with more White Americans expressing support for conservative policies.”

The ‘Love Hormone’ Can Make You Hate: Study“A study from the Netherlands suggests that oxytocin might only make you love people in your in-group, and can contribute to conflict with outsiders.”

Bacteria Turn Plants and Insects into Zombies“A parasitic phytoplasma deploys proteins to manipulate the plants it infects as well as the insects that spread the microbe.”

Zombie Snipers at the Doorstep“Colony-living insects like ants have a kind of social immune system — they behave in ways that prevent infections from spreading through their nests. They clean each other and remove the corpses of their nestmates. Sick ants, which have been infected by killer fungi, are often shunned by their fellow workers, and sometimes leave the nest to die alone.” – h/t john durant!

Germs Rule the World“The new germ theory: Infections play a role in many, many diseases—in ways we’re just beginning to understand.”

The Remarkable Self-Organization of Ants“It turns out that ants perform these complex tasks by obeying a few simple rules…. The organization of insect societies is a marquee example of a complex decentralized system that arises from the interactions of many individuals.”

The World’s Murder Capitals“[A] group of countries — all of them in either the Americas or Africa — accounting for just 11 percent of the global population are the location of 46 percent of the world’s homicides…. Men accounted for 95 percent of the perpetrators and 79 percent of the victims of homicide in 2012….”

Fearing Punishment for Bad Genes“[M]any people are avoiding the [dna] tests because of a major omission in the 2008 federal law that bars employers and health insurers from seeking the results of genetic testing.” – h/t kevin mitchell!

‘Everything should be open to question’ – h/t claire lehmann!

*A Curmudgeon’s Guide to Getting Ahead*, by Charles Murray. see also “The Curmudgeon’s Guide”: A Q&A with Charles Murray.

bonus: The Moral: Aesop Knew Something About Crows

bonus bonus: Fruit flies maneuver like tiny fighter jets

bonus bonus bonus: This 3000 Year Old Amulet Kind of Looks Like a Gummy Bear

bonus bonus bonus bonus: Measure Yourself by the Standard of the Capybara

bonus bonus bonus bonus bonus: White wing supremacist: swan attacks foreign students – h/t ed west!

bonus bonus bonus bonus bonus bonus: Mike Judge Skewers Silicon Valley With the Satire of Our Dreams“The creator of Beavis and Butt-Head aims his snark cannon at the tech startup scene in his new HBO show, Silicon Valley.”

(note: comments do not require an email. capybara and friend!)

Why We Fight (Over Land)“In the most recent issue of the journal International Security, Monica Duffy-Toft and Dominic Johnson, political scientists at Oxford, argue that a new theoretical framework is needed to analyze such behavior, one rooted in evolutionary biology…. As Duffy-Toft told me an interview today, ‘It comes back to survival and reproduction. There’s an instinct that we need land in order to exist. We need to have the capacity to get resources to live our lives….’ Duffy-Toft acknowledges that the thesis is controversial. While their piece is currently the lead article in International Security, one of the more prestigious journals in the field, it took almost 10 years to get it published. ‘We’re pushing up against real biases in our field,’ she says. ‘Scholars don’t want to admit that our behavior can be constrained by the fact that we’re animals.’ – *sigh* – original research article here [pdf].

Oldest modern human genome from Siberia ~45 thousand years ago“The femur belonged to an H. sapiens man who had slightly more Neandertal DNA, distributed in different parts of his genome, than do living Europeans and Asians.” – @dienekes’.

Human evolution: The Neanderthal in the family“Thirty years after the study of ancient DNA began, it promises to upend our view of the past.”

The phylogenetic and geographic structure of Y-chromosome haplogroup R1a – h/t razib!

Discoveries Challenge Beliefs on Humans’ Arrival in the Americas“[T]he ancient rock art depicts fierce battles among tribesmen….” – h/t steven pinker! who tweeted: “refutes frequent claim of no war before agriculture.”

Cochran-Harpending paper on “Amish Quotient”“‘[T]heir social pattern probably drives strong selection for a particular flavor of personality, which is downright fascinating and worthy of further investigation. One could, with difficulty and a lot of investment, identify dimensions of a hypothetical AQ. It would likely include affinity for work, perseverance, low status competition, respect for authority, conscientiousness, community orientation, and so on. We proposed (Cochran, Hardy, & Harpending, 2006) a similar mechanism to account for Ashkenazi Jewish evolution in Medieval times selecting for ability and success in white collar occupations.'” – from steve sailer. previously @west hunter: Inferring an AQ.

The Son Becomes The Father“The failure of parents to appreciably affect the outcomes of their children affirms Gregory Clark’s findings, and indicates that much of the transmission of status from one generation to the next is ultimately genetic in origin…. Almost certainly, throughout history, and across the diverse societies, that has been a huge amount of ‘noise’ in the transmission of status, especially on the individual level and in the short run. The vagaries of the circumstances no doubt imbued good fortune on some and dashed the success of many others. But through it all, the thing that is at the root of continuity – DNA – remained the active ingredient to propagate lineages in their respective places through out the ages.” – from jayman.

First comprehensive atlas of human gene activity released – h/t mike anissimov!

Sperm competition and Heteropaternal Superfecundation – from greg cochran.

The Holocene Lattice“First, it is now clear that long-range migration, admixture and population replacement have been the rule rather than the exception in human history. Second, the serial founder effect model is no longer a reasonable null hypothesis for modeling the ancient spread of anatomically modern humans around the globe.” – from razib. (emphases in original.)

Percentage of DNA shared amongst the various archaics (including our sapiens sapiens lineage), from a review in Cell – from billare.

Neural portraits of perception: Reconstructing face images from evoked brain activity – whoa. h/t mo costandi!

We Are All Mutants“On the hunt for disease genes, researchers uncover humanity’s 
vast diversity.”

Puerto Rico and IQ: Same as it ever was – from steve sailer.

About That Gene-Environment Interaction Study by Turkheimer et al.“The upshot is that while environmental deprivation may render genetic differences less important in the determination of children’s IQ, the typical black child in this large and downscale sample had apparently not been raised in deprived circumstances any more frequently than the typical white child in the sample. The lower IQs of blacks in this sample cannot therefore be put down to them having been exposed to environments less conducive to the expression of genetic variance in IQ than the environments experienced by whites.” – @human varieties.

People can predict the IQ of men — but not women — by looking at their face, study finds – see also dr. james thompson: The mind’s construction in a face.

Dopamine D4 receptor gene variation influences self-reported altruism“[T]he DRD4 7-repeat allele is associated with lower scores on the NEO-PI-R Altruism facet scale, accounting for about 2% of the variance. As the DRD4 7-repeat allele has been associated with higher scores in impulsive personality traits and ADHD, our result suggests that individual differences in impulsive behavioral tendencies may play a role in the propensity to behave altruistically.” – h/t tom farsides!

How Social Darwinism Made Modern China“A thousand years of meritocracy shaped the Middle Kingdom.” – from ron unz. h/t eduardo zugasti!

Kinder, gentler speech“In sum, when the State imposed a monopoly on the use of violence, it set in motion a process of gene-culture co-evolution with many consequences. Among other things, this process may have favored not only learned ways of speaking but also unlearned ways as well.” – from peter frost.

Crows Understand a Fundamental Part of Logical Reasoning“Crows are far more rational than we had realized. New research shows that wild New Caledonian crows can compete with 7-year-old children when it comes to understanding causality, or how one action causes another.” see also: Crows understand water displacement at the level of a small child: Show causal understanding of a 5- to 7-year-old child.

Do animals have a sense of humour? – koko the gorilla “once tied her trainer’s shoelaces together and signed ‘chase’.” (^_^) (^_^) (^_^) – h/t steve stewart williams!

On “Male” vs. “Female” Brains – twitter convo on sexual dimorphism in human neuro-whatsits. kevin mitchell ftw!

“Natural Law” and Other Rationalizations of Morality“People worry about a ‘grounding’ for morality. There’s really no need to. As Marc Bekoff and Jessica Pierce pointed out in Wild Justice – The Moral Lives of Animals, there are analogs of moral behavior in many species besides our own…. Other animals don’t wonder why one thing is good and another evil. They’re not intelligent enough to worry about it. Hominids are Mother Nature’s first experiment with creatures that are smart enough to worry about it. The result of this cobbling of big brains onto the already existing mental equipment responsible for moral emotions and perceptions hasn’t been entirely happy. In fact, it has caused endless confusion through the ages.” – from helian.

Inclusive fitness theory for the evolution of religion“We describe and evaluate an integrative hypothesis for the origin and evolution of human religious cognition and behaviour, based on maximization of inclusive fitness. By this hypothesis, the concept of God is represented by one’s circle of kin and social salience, such that serving God and serving this circle become synonymous. The theory is supported by data from anthropology, evolutionary theory, psychology, neuroscience, psychiatry, endocrinology and genetics.” – h/t claire lehmann!

Are liars ethical? On the tension between benevolence and honesty“[I]ndividuals who tell prosocial lies are perceived to be *more* moral than individuals who tell the truth.” – h/t zhana vrangalova!

Speculations on the Evolution of Awareness“The ‘attention schema’ theory provides one possible account of the biological basis of consciousness, tracing the evolution of awareness through steps from the advent of selective signal enhancement about half a billion years ago to the top-down control of attention, to an internal model of attention (which allows a brain, for the first time, to attribute to itself that it has a mind that is aware of something), to the ability to attribute awareness to other beings, and from there to the human attribution of a rich spirit world surrounding us. Humans have been known to attribute awareness to plants, rocks, rivers, empty space, and the universe as a whole. Deities, ghosts, souls-the spirit world swirling around us is arguably the exuberant attribution of awareness.” – h/t neuroskeptic!

Mugshots Built from DNA Data“A computer program crudely predicts facial structure from genetic variations.”

The Oldest Living Things On Earth“Starting in the 1960s, evolutionary biologists have searched for an overarching explanation to account for all the different ways to grow old. The best-supported ones so far are variants on the old truth that a jack-of-all-trades is a master of none. An organism can collect a finite amount of energy, whether it’s a lion killing gazelles, a tulip capturing sunlight, or a microbe breathing iron at the bottom of the sea. It can use that energy to grow, to produce offspring, to defend itself against pathogens, to repair damaged its damaged molecules. But it has a limited budget. The energy spent on one task is energy that can’t be spent on others. Molecular repair and pathogen defense are both good ways to live longer. But a long-lived organism that produces few offspring will not pass on many copies of its genes to future generations. The organisms that will succeed are the ones that do a mediocre job of keeping their bodies in order, leaving more energy for making babies.” – h/t billare!

Mutation, Not Natural Selection, Drives Evolution – according to masatoshi nei: “Every part of our body is controlled by molecules, so you have to explain on a molecular level. That is the real mechanism of evolution, how molecules change. They change through mutation. Mutation means a change in DNA through, for example, substitution or insertion [of nucleotides]. First you have to have change, and then natural selection may operate or may not operate. I say mutation is the most important, driving force of evolution. Natural selection occurs sometimes, of course, because some types of variations are better than others, but mutation created the different types. Natural selection is secondary.”

End the Hype over Epigenetics & Lamarckian Evolution“They insist that characteristics many researchers assume to be the result of epigenetic inheritance are actually caused by something else. The authors list four possibilities: Undetected mutations in the letters of the DNA sequence, behavioral changes (which themselves can trigger epigenetic tags), alterations in the microbiome, or transmission of metabolites from one generation to the next. The authors claim that most epigenetic research, particularly when it involves human health, fails to eliminate these possibilities.” – h/t jayman!

New warning about ‘Celtic Curse’ blood iron disease“Hemochromatosis is a hereditary disease, linked particularly to Irish and those of Irish origin. It causes your body to absorb too much iron from the food you consume. The excess iron becomes stored in your organs, especially your liver, heart and pancreas. It can lead to life-threatening conditions such as cancer, heart problems and liver disease. Those with Irish heritage have a significantly greater chance of carrying the gene mutation that can contribute to the deadly disorder. Some experts believe that hemochromatosis originated more than 40,000 years ago in Ireland when genes mutated allowing the population to over-absorb iron, to compensate for a poor iron diet.” – h/t 23andMe!

The state is the worst wicked stepmother of all“[T]he number of children raised without one of their parents has increased sharply in recent years, partly due to changing sexual mores but also the involvement of the state itself; the largest increase in non-marital births came after the 1977 Homeless Persons Act gave lone mothers priority on housing lists. The Tory MP behind this proposal wrote, ‘The sad truth is that, until now, the Wicked Stepmother would have got away scot-free.’ Possibly, but there would not have been so many wicked stepmothers, or stepfathers, or mother’s current boyfriends, without the state in the first place.” – from ed west.

Pseudoescepticismo y biodiversidad humana“Desde hace años, sin embargo, existe una tendencia ideológica inflacionaria en el movimiento escéptico que tiende a alejarse del ‘núcleo’ original, cuyos contornos de todos modos son imprecisos (¿es la parapsicología una ciencia?). El inconveniente es que este alejamiento del núcleo, yo lo llamaría ‘escepticismo inflacionario’ o simplemente pseudoescepticismo, desdibuja los criterios de demarcación y hace que los nuevos temas sean más y más propensos a la contaminación moral e ideológica…. Un caso bastante claro es la campaña ‘escéptica’ de descrédito contra la psicología evolucionista, que sólo ha convencido a un pequeño grupo. ¿Pudiera ser que el empeño de grupos ‘escépticos’ de asimilar el movimiento de biodiversidad humana con el ‘racismo científico’ y con la ‘pseudociencia’ (la falacia moralista siempre merodeando) corriera una suerte parecida?” – @la revolución naturalista.

Response to ‘Fists of furry: at what point did human fists part company with the rest of the hominid lineage?’“A Swedish study on interpersonal violence reported 63 facial fractures and 57 concussions inflicted by fists, but only eight fractures of the metacarpal or phalangeal bones (Boström, 1997). Thus, human fists are effective weapons and, when humans fight, faces break more frequently than fists.” – h/t john hawks!

Sexually Transmitted Virus Sterilises Insects, Turns Them On“[O]ne particular insect virus can sterilise crickets, but also change their behaviour so they continue to mate with each other. By doing so, they pass the virus on to uninfected hosts.”

Ancient African cattle first domesticated in Middle East, study reveals“The genetic history of 134 cattle breeds from around the world has been completed by a group of researchers. In the process of completing this history, they found that ancient domesticated African cattle originated in the ‘Fertile Crescent,’ a region that covered modern day Iraq, Jordan, Syria and Israel.” – h/t anthropology tip!

Autism characteristics differ by gender, studies find – h/t hbd bibliography! also: Autism begins in pregnancy, according to study: Cortical layers disrupted during brain development in autism – h/t mr. robert ford!

Men ‘size-up’ male competition by watching dance moves” The results revealed that handgrip strength and arm movements of the dancers were predictors of dance quality ratings. Both men and women rated stronger males with larger, more variable and faster arm movements as better dancers. However, men picked up clues of upper-body strength from male dancing more accurately than women.” – previously: “you should be dancin’ yeah!”

A Study of Twins, Separated by Orbit“While circling the earth aboard the International Space Station for a full year — the longest single space adventure for any American astronaut — and after his return, scientists will closely monitor Commander Kelly to see what changes space has wrought. NASA has been studying the effects of long stays in space on astronauts for years, but this set of 10 investigations will be different: The scientists will be doing the same poking, prodding and analyzing on Commander Kelly’s identical twin brother, Mark, a retired astronaut.”

A simple but elegant method to detect election fraud and irregularities. – from randy olson.

bonus: Game of Thrones tells the story of Britain better than most histories“The popular TV drama gives a vivid idea of how people might have behaved in the Middle Ages – which is brutally” – from ed west. and coming out on thursday!: Ebook on the history behind ‘Game of Thrones’ – by ed west. what does he mean, “there aren’t really dragons”??!?

bonus bonus: L.L. Cavalli-Sforza. A bird in a gilded cage. – new ebook from peter frost!

bonus bonus bonus: Advice for a Happy Life“Consider marrying young. Be wary of grand passions. Watch ‘Groundhog Day’ (again).” – from charles murray.

bonus bonus bonus bonus: The War Nerd: Who exactly are the Jihadis (and why aren’t there more of them)?“There’s one simple generalization you can make from these stats: Jihadis from Muslim-majority countries are generally higher-status than those from countries where Muslims are a minority.” – h/t michael “the sailor” story!

bonus bonus bonus bonus bonus: Neurosurgeons successfully implant 3D printed skull – whoa.

bonus bonus bonus bonus bonus bonus: Woolly Mammoths Suffered Major Birth Defects Before Extinction“According to the researchers, this influx of birth defects could have come about in two different ways. The genetic mutations could have arisen from inbreeding depression. As mammoths were reduced in number, genetic diversity would have plummeted and the number of mutations would have risen sharply. The other explanation offered states that expecting mothers would have been under considerable stress as the population dwindled. This prenatal stress could have had negative consequences for fetal development.” – h/t avi tuschman!

bonus bonus bonus bonus bonus bonus bonus: A Day in the Life of an Ancient Athenian Citizen – from blowhard, esq. h/t ray sawhill! (for some reason, i always crave a cocktail after visiting uncouth reflections…. (^_^) *hic*)

bonus bonus bonus bonus bonus bonus bonus bonus: Greatest Invention in Human History Helps You Avoid Certain People“The era of antisocial networking has begun with the development of apps such as Cloak, which identifies locations of your contacts so you don’t have to see them.” – FIIIInally!

bonus bonus bonus bonus bonus bonus bonus bonus bonus: Absurd Creature of the Week: The 6-Foot Earthworm That Sounds Like a Draining Bathtub – h/t charles (aka the doctor! (^_^) )!

(note: comments do not require an email. gippsland earthworm!)

*update below*

i thought i’d do a big summary post on the hajnal line, just to have everything in once place. (^_^) sorry, there is no tl;dr, so go get yourself a cup of coffee. i’ll wait here.

back already?! ok…

so, here is the hajnal line:

hajnal line

from wikipedia: “The line in red is Hajnal’s. The dark blue lines show areas of high nuptiality west of the Hajnal line.”

obviously this is a schematic map. the true hajnal line should, no doubt, be all squiggly. i also suspect that a few other areas in western europe ought to be “outside” the hajnal line as well: highland scotland most definitely and galicia in spain possibly, although that latter one is more of a guess. possibly brittany, too, while i’m at it. oh, and it also appears as though the hajnal line should run through finland somewhere, separating the east from the west, with the eastern part being INSIDE the line. more on that…someday. (*^_^*)

anyway, more from wikipedia: “The Hajnal line is a border that links Saint Petersburg, Russia and Trieste, Italy. In 1965, John Hajnal discovered it divides Europe into two areas characterized by a different levels of nuptiality. To the west of the line, marriage rates and thus fertility were comparatively low and a significant minority of women married late or remained single; to the east of the line and in the Mediterranean and select pockets of Northwestern Europe, early marriage was the norm and high fertility was countered by high mortality.

“West of this line, the average age of marriage for women was 23 or more, men 26, spouses were relatively close in age, a substantial number of women married for the first time in their thirties and forties, and 10% to 20% of adults never married. East of the line, the mean age of both sexes at marriage was earlier, spousal age disparity was greater and marriage more nearly universal. Subsequent research has amply confirmed Hajnal’s continental divide, and what has come to be known as the ‘Western European marriage pattern’, although historical demographers have also noted that there are significant variations within the region; to the west of the line, about half of all women aged 15 to 50 years of age were married while the other half were widows or spinsters; to the east of the line, about seventy percent of women in that age bracket were married while the other thirty percent were widows or nuns….

The region’s late marriage pattern has received considerable scholarly attention in part because it appears to be unique; it has not been found in any other part of the world prior to the Twentieth Century. The origins of the late marriage system are a matter of conjecture prior to the 16th Century when the demographic evidence from family reconstitution studies makes the prevalence of the pattern clear; while evidence is scanty, most English couples seemed to marry for the first time in their early twenties before the Black Death and afterward, when economic conditions were better, often married in their late teens.”

so, the two big things that hajnal discovered: late marriage common in western europe plus a lot of individuals never marrying in western europe.

hajnal’s original article on his line — “European marriage pattern in historical perspective” — was published in 1965 in Population in History: Essays in Historical Demography.
_____

as if that weren’t interesting enough on its own, there seems to be a lot of other things connected — or somehow related — to the hajnal line. for instance, the distribution of nuclear families in europe. here’s a map of emmanuel todd‘s traditional family systems in europe — the absolute, egalitarian, and stem families (yellow, blue, and green on the map) are all types of nuclear or small-sized families (the stem family is the immediate family plus one set of grandparents, so it has slightly more members than a pure nuclear family). as you can see, small families (nuclear and stem families) occur most frequently to the west of or “inside” the hajnal line, community or extended families more frequently outside of it (h/t m.g. for the map! — hajnal line added by me):

todd - traditional family systems of europe - hajnal line sm

the distribution of average national iqs also seems to be related to the hajnal line — in general, higher average national iqs are found inside the hajnal line rather than outside of it (h/t jayman for this map! — hajnal line added by me):

jayman's map + hajnal line

perhaps thanks to the distribution of average iqs (although i don’t think that iq is the whole story), maybe we shouldn’t be surprised to find the highest concentrations of human accomplishment in europe distributed like this, i.e. falling mostly within the hajnal line (h/t charles murray for the map! — hajnal line added by me):

charles murray - human accomplishment map - european core + hajnal line

nations west of the hajnal line tend to be stronger in democratic tendencies than nations east of the line. here’s a map of the economist’s intelligence [sic] unit’s 2012 democracy index results for europe — with hajnal line added (by me). the darker the green, the more democracy:

democracy index - europe - 2012 + hajnal line

the populations west of the hajnal line also appear to be more civic-minded than those to the east of it. civicness here is determined using robert putnam’s technique of looking at participation rates in voluntary associations. the data below are drawn from the world values survey — see more details in this post — and this one, too! (sorry, i haven’t got a map for these data, so you’ll have to make do with a table. the data for each individual country can be found in this post. the eastern european countries — circled in red — are all fully or partially east of the hajnal line. the remainder are not, although remember that southern italy and southern spain — two of the “southern europeans” here — are. note also that “anglos” includes the u.s., canada, australia, etc. — for great britain’s scores, see this post. click on table for LARGER view.)

wvs - membership voluntary organizations - totals - hajnal line

and perceived corruption is generally lower inside the hajnal line than outside. here is a map based on transparency international’s corruptions perceptions index scores for europe in 2012 (hajnal line added by me):

europe-corruption-2012 + hajnal line

populations inside the hajnal also tend to score higher on individualism on hofstede’s individualism versus collectivism (IDV) dimension, while those outside the hajnal line are more collectivistic (see this post). here is a map of these scores that i swiped off the internet. i have a few reservations about this map which i discussed in the previous post — the raw scores are also listed in that post (hajnal line added by me):

individualism-map-2 + hajnal line

and here’s a map taken from steven pinker’s Better Angels of the geography of homicide in late nineteenth century europe (hajnal line added by me). the homicide rates were significantly lower inside the hajnal line than outside of it in the late nineteenth century (more on this later in the post):

pinker - fig. 3.8 - hajnal line02_____

so, to sum up — INSIDE (or to the west of) the hajnal line we find:

- late marriage and 10-20% of adults never marrying
– small families, either nuclear or stem
– higher average iqs than outside the line
– the highest concentrations of human accomplishment in europe
– more democracy
– greater civic-mindedness or orientation towards the commonweal
– generally low perceived corruption
– high individualism
– and low homicide rates in the 19th century

why?

at first glance, the most obvious explanation would seem to be simply that these are all germanic populations to some extent or another. we’ve got the franks and co. in france and the low countries, the visigoths in northern spain, the langobards (and others) in northern italy, the swiss, the austrians, the scandinavians, and the peoples who became “the germans” in germany after they reconquered those areas during the ostsiedlung. and maybe that’s it. maybe that’s the whole story. i don’t think so, though, although it’s likely a part of the story (perhaps even a big part, i dunno).

why don’t i think that’s the whole story?

well, first of all, despite what you might’ve heard from tacitus, the pre-christian germanics did not marry late. going by the archaeological evidence (i.e. the types of grave goods found associated with girls aged around twelve to fourteen), it appears that pre-christian germanic women married young — probably right around the time they hit puberty. not sure about the men, but the case of the females indicates that hajnal’s line does not extend back into pre-christian times. odds are, too, that, like in most other societies in the world, the majority married, but i have no evidence for that either way.

additionally, the nuclear family was not the primary foundational building block of pre-christian germanic societies. while the pre-christian germanics do seem to have had residential nuclear families, it was the extended family — the kindred — that was of utmost importance both socially and legally to the germanic tribes (see for example this post). (this, btw, is similar to sicilians and other southern italians today, as well as to the greeks — these groups have residential nuclear families, but the extended family is very, *very* important in those populations. this is something that, i think, emmanuel todd overlooked. planning to work up a post on the topic…one of these days. (^_^) )

there are also no indications that the pre-christian germanics were particularly bright. they didn’t build any aqueducts anyway.

also — and i know this will get some of you riled up — the pre-christian germanics weren’t any more democratic than any other clannish populations on the planet were in the past or are today. yes, yes, i know, i know — the things! yes. i know. you’ll have to trust me on this for now — those things are not very good indicators of the presence of democracy. at least not democracy as we know it (or like to think we know it). i will come back to this in another post, i promise! for now, please just trust me on this. (for a couple of hints on what i’ll be getting at, you can have a look at this post and the first section of this post where i mention democracy in medieval iceland.)

it’s also unlikely that the pre-christian germanics were particularly oriented towards the broader commonweal either. pre-christian germanic society was, as i said, structured around the extended family, or the kindreds, and blood-feuds between kindreds were common (and legal). in any other society that i know of which is structured like that — like afghani society today, for instance (although there they have even tighter clans — the germanic kindreds had a looser configuration) — the members are not interested in the common good. they are interested in their extended family’s good. that’s it. in such societies, too, individualism usually runs second to collectivism — again, that’s a collective attitude toward the extended family, not the broader society. not sure how much individualism there was in pre-christian germanic society. still need to find that out (if possible).

finally, the violence/homicide rates in pre-christian germanic societies were undoubtedly high. the omnipresent blood-feuds — not to mention all of the whopping great germanic swords and the seaxes — indicate that this was probably the case.
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the historic evidence for the existence of the hajnal line goes back to the 1500s, but no one’s quite sure when the pattern first emerged. the only thing that’s clear is that it was sometime between the introduction of christianity to the germanics in northern europe (which started in something like the 400s) and the 1500s.

two of the biggest changes to this area of europe beginning in the early medieval period were: the introduction of new mating patterns thanks to the catholic church and the introduction of manorialism. these two elements of medieval european society were present in the areas inside the hajnal line and were absent to various degrees in the areas outside the line. in fact, hajnal’s line lies exactly at the limits of western christendom and the (bipartite) manor system in eastern europe (and southern italy and spain and ireland, etc.). this is not my idea, but something i picked up from the historian michael mitterauer’s book Why Europe? [pgs. 45-45]:

“The most significant expansion of the model agricultural system [manorialism] in the Frankish heartland between the Seine and the Rhine took place toward the east. Its diffusion embraced almost the whole of central Europe and large parts of eastern Europe….. This great colonizing process, which transmitted Frankish agricultural structures and their accompanying forms of lordship, took off at the latest around the middle of the eighth century. Frankish majordomos or kings from the Carolingian house introduced manorial estates (*Villikation*) and the hide system (*Hufenverfassung*) throughout the royal estates east of the Rhine as well…. The eastern limit of the Carolingian Empire was for a long time an important dividing line between the expanding Frankish agricultural system and eastern European agricultural structures. When the push toward colonization continued with more force in the High Middle Ages, newer models of *Rentengrundherrschaft* predominated — but they were still founded on the hide system. This pattern was consequently established over a wide area: in the Baltic, in large parts of Poland, in Bohemia, Moravia and parts of Slovakis, in western Hungary, and in Slovenia.”

but note that the manor system was introduced into these eastern regions much later than it had been in the west. more from mitterauer:

Colonization established a line streching roughly from St. Petersburg to Trieste. We will come across this line again when studying European family systems and their diffusion. The sixteenth century witnessed the last great attempt to establish the hide system throughout an eastern European region when King Sigismund II of Poland tried it in the Lithuanian part of his empire in what is modern-day Belarus. The eastward expansion of Frankish agrarian reform therefore spanned at least eight centuries.”

mitterauer also discusses the hows and whys of the absence of manorialism in southern italy, spain, ireland, etc. — in other words, all of the populations which are today outside the hajnal line [pg. 54]:

“Over against this ‘core Europe’ was a ‘peripheral Europe’ that did not acquire these structures until a relatively later date — or not at all. Here we can list Ireland, Wales, and Scotland in the West; the area of eastern Europe beyond the Trieste-St. Petersburg line that was unaffected by the colonization of the East; the entire Balkan region; southern Italy, which was formerly Byzantine, along with the southern part of the Iberian Peninsula that was under Moorish rule for so long a time. The political, economic, and social evolution of many regions in ‘peripheral Europe’ took a different turn because of their clinging to other, traditional agricultural systems.”

there’s no map in Why Europe? showing the areas of europe that were “manorialized” according to mitterauer, so i gave a shot at creating one based on mitterauer’s descriptions in the book (frisia was never manorialized, btw):

extent and spread of manorialism

yup! looks pretty much just like the hajnal line.

manorialism is important for at least two reasons — and probably many more that i haven’t thought about. firstly, the whole system was based on nuclear families. in the bipartite manor system, peasants or serfs or whomever (depending on time and place in western europe) lived on and managed their own farms (let out to them by the manor owner) and also worked on the manor or paid rent to the manor. extended families very much did not fit into the manor system as it operated in western europe (there was a different development in eastern europe where extended families were very much part of the package). so manorialism — at least western manorialism — “pushed” for the nuclear family. as early as the 800s in northwestern france, families that lived and worked on manors were very small, most often being only two generations (parents and children) and occasionally including a grandparent.

the second reason manorialism was so important was because this was the vehicle via which the ecclesiastical and secular laws against cousin marriage could be enforced. as greying wanderer commented the other day:

“Not only was the land owned by the Lord of the Manor rather than by the village commune as it was elsewhere the manor with its central manor house and church was a model of combined civil and religious authority. Those villagers who wanted to get ahead with their own little plot of land had to be respectable and that meant if married it had to abide by the church’s rules.”

exactly!

so, because the populations in peripheral europe missed out on manorialism, they also missed out on the “push” for nuclear families and the more stringent enforcement of the cousin marriage bans.

however, mitterauer makes the point that it appears as though conversion to christianity was needed first before manorialism could be successfully introduced [pg. 77]:

“The introduction of Christianity always preceded the introduction of the hide system throughout the entire colonization in the East — often by only a slight difference in time, but occasionally centuries earlier. The time sequence was never reversed, anywhere. The western agrarian system at all times found a state of affairs where Christian conversion had either relaxed or weakened older patrilineal patterns. This process had already paved the way for the transition to a bilateral system of kinship and the conjugal family.”

medieval christianity weakened the old patrilineal clannish (or kindred-based) systems because it insisted upon the avoidance of cousin marriage which reduced the genetic ties between extended family members and set the stage for the selection of very different behavioral patterns in parts of northwestern europe — “core” europe. orthodox christianity in eastern europe also banned close cousin marriage, but this came later in that area of the world (since they adopted christianity later), and enforcement was not as firm as in the west — the secular regulations on marriage in medieval russia, for instance, flip-flopped several times and do not seem to have backed up the orthodox church’s canon laws as consistently as secular authorities had tended to do in the west (see here and here for example). and, again, the manor system was a very late arrival in eastern europe, and in many places it was not a bipartite system based upon nuclear families. the eastern european extended family networks were incorporated into the manor system which developed there, because the extended family had never been broken apart in the east, since the cousin marriage bans were adopted at a later point in time and were not as strongly enforced.
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the long-term outbreeding of northwestern europeans, which began in the early medieval period, resulted in a new social environment for these populations. gone were the clans and kindreds, gone were the extended families, gone was the close genetic relatedness between extended family members (in inbreeding societies, the probability that first cousins share genes [alleles] in common can be nearly double of that in outbreeding societies). this was all replaced by a society based upon individuals and their nuclear families — and each of these “new europeans” were more unique genetic individuals than those in more inbred societies who share more genes in common with their relatives.

with a new environment — in this case a new social environment — comes new selection pressures. the question to ask with regard to these big changes in medieval western europe is who succeeded in this brave new world? what sort of individuals managed to do well in life and reproduce successfully? the most. what sorts of personality traits did “the fittest” have? intelligence levels? behavioral patterns? what sorts of genes got selected for in this new environment?

the new patterns of genetic relatedness between individuals would’ve (i think) changed the speed at which alleles for different sorts of behavioral traits — especially those related to altruistic behaviors — might’ve been selected (see here for example). in a long-term outbreeding society, it might pay to be altruistic towards two brothers or eight cousins, but if you’re from a long-term inbreeding society, you might only need to be altruistic towards four or five cousins to achieve the same genetic payoff. and, if you actually are altruistic towards the full number of eight cousins, whatever “genes for altruism” that you and your cousins carry will be selected for faster than in an outbreeding society, since you all carry more copies of them than outbreeding individuals do.

in the societies outside the hajnal line, then, where the populations experienced, to differing degrees, more long-term inbreeding than those inside the hajnal line, people continue to favor their family members (or those whom they consider “one of theirs”) more. such behaviors continued to pay — genetically speaking — for longer, so these “altruistic” behaviors never got weeded out of those populations — or not so much anyway. therefore, the individuals in populations outside of the hajnal line tend to exhibit innate behaviors that favor themselves as members of extended families as opposed to favoring themselves as individual players in a broader community. this common thread of favoring the family (and/or intimate allies) can, i think, explain the common characteristics of societies that are outside the hajnal line: being comprised of large, tightly-knit extended families; having low average iqs (because individuals don’t have to fend for themselves as much?); having less democracy, less civic-mindedness, and greater amounts of corruption (including nepotism) since everyone is more oriented towards their own than to unrelated strangers; and having higher homicide rates.

on the other hand, what sorts of traits would’ve been selected for in individuals in long-term outbreeding societies where there would’ve been less of a genetic payoff in being altruistic towards extended family? i think you would (or could) have greater selection for individuals having behavioral traits which drive them to contribute more to the broader community. since the payoff for aiding extended family was no longer so great in “core” europe after many generations of outbreeding (i.e. avoiding close cousin marriage), it might’ve begun to pay equally well — or well enough — to aid non-family members (rather than extended family members) — to cooperate with them in the hopes of receiving aid back. in a society where one doesn’t have an extended family to fall back on, it might be very useful to possess traits which enable the successful collaboration with non-family — being trusting and trustworty, for instance. a society of such individuals might very likely: be comprised of small-sized families; have a higher average iq since individuals had to fend for themselves more; have more (liberal) democracy, more civic-mindedness, and less corruption since everyone would be more oriented towards the commonweal and not towards their extended family members. homicide rates would be low, too.
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if this hajnal line divide between western and eastern europe sounds a lot like huntington’s civilizational divide which steve sailer posted about the other day, that’s because it probably is very much the same divide. but the divide is not just between the western and eastern churches, it’s a divide between a long history of different mating patterns and family types in the west versus the east — much more outbreeding (i.e. the avoidance of close cousin marriage) for a longer period of time, and the development of and emphasis upon small families as opposed to large extended families, in the west and not in the east — and the divergent selection pressures that the two european civilizations underwent thanks to the differing mating patterns/family types. from huntington:

“The most significant dividing line in Europe, as William Wallace has suggested, may well be the eastern boundary of Western Christianity in the year 1500. This line runs along what are now the boundaries between Finland and Russia and between the Baltic states and Russia, cuts through Belarus and Ukraine separating the more Catholic western Ukraine from Orthodox eastern Ukraine, swings westward separating Transylvania from the rest of Romania, and then goes through Yugoslavia almost exactly along the line now separating Croatia and Slovenia from the rest of Yugoslavia. In the Balkans this line, of course, coincides with the historic boundary between the Hapsburg and Ottoman empires. The peoples to the north and west of this line are Protestant or Catholic; they shared the common experiences of European history — feudalism, the Renaissance, the Reformation, the Enlightenment, the French Revolution, the Industrial Revolution; they are generally economically better off than the peoples to the east; and they may now look forward to increasing involvement in a common European economy and to the consolidation of democratic political systems. The peoples to the east and south of this line are Orthodox or Muslim; they historically belonged to the Ottoman or Tsarist empires and were only lightly touched by the shaping events in the rest of Europe; they are generally less advanced economically; they seem much less likely to develop stable democratic political systems.”

the earliest start to what i’ve (jokingly!) dubbed The Outbreeding Project in europe that i’ve found so far occurred in northeast france/the low countries and southeastern england. this, i think, is the core of “core europe”:

hajnal line - core europe

outbreeding began earliest in this region as did manorialism, and both radiated out from this central core mainly to the south and east. my bet is that there exists a gradient or clinal(-like) spread of whatever genes (alleles) are connected to the civicness behavioral traits belonging to the long-term outbreeding western european populations and that that spread starts in and around the area of the green circle (if the theory is right at all, that is! (~_^) ).

one set of behaviors that definitely began in this region and radiated out from it was the marked reduction in violence (homicides) in the middle ages as discussed by steven pinker in Better Angels. a fellow named manuel eisner found [see previous post]:

“[T]he data suggest that the secular trajectories of low homicide rates differ among large geographic areas. It appears that English homicide rates were already considerably lower in the late sixteenth century than during the late Middle Ages and that they declined continuously along a log-linear trend over several centuries. Extant estimates for the Netherlands and Belgium suggest a very similar structure trend in these areas. In the Scandinavian countries, the transistion to the decreasing trend occurs notably later, namely in the first decades after 1600. Despite huge gaps in the data, the German-speaking areas may also be assumed to have joined the declining trend from the early seventeenth century onwards. For Italy, however, all the available data indicate that acts of individual-level lethal violence remained very frequent until the early nineteenth century. It is not until the mid-nineteenth century that the rate begins to decline, but then very steeply.”

as i said in my previous post:

“hmmmm. now where have i heard a pattern like this before? england, the netherlands, germans earliest in *something*…scandinavians later…italians last.”

liberal democracy also starts in this core of “core europe” — it was pretty much invented by the english. the dutch pretty much invented capitalism (per daniel hannan). and t.greer points out that this is exactly where the great economic divergence began earliest:

“A few months ago I suggested that many of these debates that surround the ‘Great Divergence’ are based on a flawed premise — or rather, a flawed question. As I wrote:

“‘Rather than focus on why Europe diverged from the rest in 1800 we should be asking why the North Sea diverged from the rest in 1000.‘

“By 1200 Western Europe has a GDP per capita higher than most parts of the world, but (with two exceptions) by 1500 this number stops increasing. In both data sets the two exceptions are Netherlands and Great Britain. These North Sea economies experienced sustained GDP per capita growth for six straight centuries. The North Sea begins to diverge from the rest of Europe long before the ‘West’ begins its more famous split from ‘the rest.’

“[W]e can pin point the beginning of this ‘little divergence’ with greater detail. In 1348 Holland’s GDP per capita was $876. England’s was $777. In less than 60 years time Holland’s jumps to $1,245 and England’s to 1090. The North Sea’s revolutionary divergence started at this time.”
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so, apart from indicating patterns of nuptuality in late medieval and modern europe, hajnal’s line also represents the extent of both manorialism and The Outbreeding Project on the continent. both of these together set up a very new and different sort of social environment for western europeans — a new, and quite unique, social environment which exerted some very different sorts of selection pressures on the populations, particularly on social behaviors, but perhaps on other traits as well.

i’ve been wondering lately what sorts of selection pressures the manor system on its own might’ve had on the population. time preference might be a big one — and this is where all of the late marriage comes in. couples often had to wait for a small farm to become available on a manor before they could marry and begin having kids. those who could wait may very well have been more successful than those who couldn’t (and who would’ve been shipped off to monasteries and nunneries for their lack of chastity). perhaps higher iq individuals, who could successfully manage their own farms as part of the manor system, also did well.

that’s it for now!

many thanks, btw, to all of you out there who have been thinking this through with me for the last couple of years! (^_^) i would name names, but then i’d probably forget to mention someone — ya’ll know who you are! thank you, thank you, thank you! (^_^)
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update 03/12: see also Rise of the West and the Hajnal line from mr. mangan, esq!

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see also: How Inbred are Europeans? from jayman.

previously: the hajnal line and todd’s family systems and the hajnal line and behind the hajnal line and “core europe” and human accomplishment and civic societies and civic societies ii and national individualism-collectivism scores and historic european homicide rates…and the hajnal line and outbreeding, self-control and lethal violence and medieval manoralism and the hajnal line and more on the origins of guilt in northwestern european populations and whatever happened to european tribes?

also, please see the “mating patterns in europe series” below ↓ in left-hand column for posts dealing with specific populations.

(note: comments do not require an email. john hajnal!)

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