linkfest – 03/05/14

DNA USA*“[A]bout about 4 percent of whites have at least 1 percent or more African ancestry. Although it is a relatively small percentage, the percentage indicates that an individual with at least 1 percent African ancestry had an African ancestor within the last six generations, or in the last 200 years. This data also suggests that individuals with mixed parentage at some point were absorbed into the white population. Looking a little more deeply into the data, Kasia also found that the percentage of whites with hidden African ancestry differed significantly from state-to-state. Southern states with the highest African American populations, tended to have the highest percentages of hidden African ancestry…. Previous published studies estimate that on average African Americans had about 82 percent African ancestry and about 18 percent European ancestry. But in self-identified African Americans in 23andMe’s database, Kasia found the average amount of African ancestry was closer to 73 percent. Kasia found significant differences in state-to-state comparisons. African Americans in the northern and western states have more mixed ancestry than those in the southern states…. On average Latinos had about 70 percent European ancestry, 14 percent Native American ancestry and 6 percent African ancestry. The remaining ancestry is difficult to assign because the DNA is either shared by a number of different populations around the world, or because it’s from understudied populations, such as Native Americans.” – from 23andMe.

Common Variants in the CDH7 Gene are Associated with Major Depressive Disorder in the Han Chinese Population“Recent genome-wide association study also demonstrated that CDH7 was significant associated with bipolar disorder…. Our results support CDH7 to be a risk factor of MDD in the Han Chinese population. However, further studies with more markers and independent samples were suggested to validate our findings.”

Humans May Have Been Stuck on Bering Strait for 10,000 Years“In the new Perspectives article, published today (Feb. 27) in the journal Science, the researchers compile existing data to support the idea, known as the Beringia standstill hypothesis. Among that evidence is genetic data showing that founding populations of Native Americans diverged from their Asian ancestors more than 25,000 years ago. In addition, land in the region of the Bering Strait teemed with grasses to support big game (for food) and woody shrubs to burn in the cold climate, supporting a hard-scrabble existence for ancient people.” – razib is skeptical.

Was skin cancer a selective force for black pigmentation in early hominin evolution?“[D]ata on age-associated cancer incidence and lethality in albinos living at low latitudes in both Africa and Central America support the contention that skin cancer could have provided a potent selective force for the emergence of black skin in early hominins.”

Neanderthal Introgression at Chromosome 3p21.31 Was Under Positive Natural Selection in East Asians“Studies of the Neanderthal and Denisovan genomes demonstrate archaic hominin introgression in Eurasians. Here, we present evidence of Neanderthal introgression within the chromosome 3p21.31 region, occurring with a high frequency in East Asians (ranging from 49.4% to 66.5%) and at a low frequency in Europeans. We also detected a signal of strong positive selection in this region only in East Asians…. [S]uggestive evidence supports latitude-dependent selection, implicating a role of ultraviolet-B.”

Neanderthals challenge the origins of speech“Neanderthals, may well have spoken in languages not dissimilar to the ones we use today…. [I]n terms of mechanical behaviour, the Neanderthal hyoid was basically indistinguishable from our own, strongly suggesting that this key part of the vocal tract was used in the same way. ‘From this research, we can conclude that it’s likely that the origins of speech and language are far, far older than once thought.'” – h/t billare (who is 0.1% neanderthal)!

READ THIS (yes, there *will* be a pop quiz on the material later in the week (~_^) )!: Environmental Hereditarianism“[T]here is little evidence linking most ‘measurable’ aspects of the environment to human physical or behavioral traits…. Most of the solid evidence we do have for environmental impacts come in the forms of things that do physical damage (e.g., maiming limbs or traumatic brain injury) – a category which includes poisons; or are developmental deficits, such as malnutrition. Much of the rest of it (take your pick) is lacking.” – from jayman. – previously: it’s not nature and nurture….

Outliers – from greg cochran.

New evidence confirms link between IQ, brain cortex“Rate of change in the thickness of the brain’s cortex is an important factor associated with a person’s change in IQ, according to a collaborative study by scientists in five countries…. This study is the first to show the association between cortical thickness and development in full scale IQ, and has potentially wide-ranging implications for the pedagogical world and for judicial cases in which the defendant’s IQ score could play a role in determining the severity of the sentence.”

The Germ Theory of Democracy, Dictatorship, and All Your Most Cherished Beliefs“What kind of government do you live under? Who are your sexual partners? How do you treat strangers? All of these questions may mask a more fundamental one: What germs are you warding off?” – h/t jason collins! – but see this previous post: pathogens and consanguinity“the BIG outliers, though, are the arabs and all their middle eastern/north african/south asian muslim buddies. they are the ones throwing off the correlation completely…. these societies are amongst those that have the highest consanguinity rates, and yet some of their pathogen index scores are *very* low.” that part of the world also does not do well when it comes to (liberal) democracy. – see also jayman’s response.

Nicholas Wade Takes on the Regime – jared taylor reviews nicholas wade’s upcoming book on race. – h/t hbd bibliography! – see also this comment from jayman. – and see also Harmful, toxic equalism from the awesome epigone.

The Nature of Race – from karl boetel and john furest. see also here.

12,000 year old prehistoric art shows woman hunting – maybe. kinda/sorta. (not really.) – from adam benton.

Altruism and the Dark Side of Agreeableness“[B]eware of really nice people. If they seem too good to be true, they usually are.” – from staffan.

Forgotten fathers: paternal influences on mammalian sex allocation“A growing body of evidence suggests that the assumption that males produce an unbiased proportion of X- and Y-chromosome-bearing spermatozoa is not always valid with significant between- and even within-individual variation.” – a mechanism for trivers-willard? – h/t lars penke!

Digit Span: the modest little bombshell and What does IQ 70 mean for black and white kids? – from dr. thompson.

The paradox of the Visual Word Form Area“The VWFA functions differently in different human populations. The difference is striking between people who use alphabetical script, where each symbol represents a sound, and those who use logographic script, where each symbol represents an idea. Chinese subjects process their idea-based symbols with assistance from other brain regions, whereas Westerners process their sound-based symbols only in the VWFA.” – from peter frost.

The man who destroyed America’s ego“How a rebel psychologist challenged one of the 20th century’s biggest—and most dangerous—ideas…. Among the most egregious errors they discovered were those in the papers that focused on academic performance. A correlation had been repeatedly found between high self-esteem and good grades. So, the logic went, if you boosted self-esteem you’d also boost grades. But the authors had made one of the most elementary mistakes in science. ‘When they tracked people over time,’ says Baumeister, ‘the grades came first, and then the self-esteem. High self-esteem was a *result* of good grades, not a cause.'” – h/t matthew wygant!

Genetic Influences on Political Ideologies: Twin Analyses of 19 Measures of Political Ideologies from Five Democracies and Genome-Wide Findings from Three Populations“Here we present results from original analyses of a combined sample of over 12,000 twins pairs, ascertained from nine different studies conducted in five democracies, sampled over the course of four decades. We provide evidence that genetic factors play a role in the formation of political ideology, regardless of how ideology is measured, the era, or the population sampled…. We then present results from one of the first genome-wide association studies on political ideology using data from three samples: a 1990 Australian sample involving 6,894 individuals from 3,516 families; a 2008 Australian sample of 1,160 related individuals from 635 families and a 2010 Swedish sample involving 3,334 individuals from 2,607 families. No polymorphisms reached genome-wide significance in the meta-analysis. The combined evidence suggests that political ideology constitutes a fundamental aspect of one’s genetically informed psychological disposition, but as Fisher proposed long ago, genetic influences on complex traits will be composed of thousands of markers of very small effects and it will require extremely large samples to have enough power in order to identify specific polymorphisms related to complex social traits.”

Why Americans Are So Polarized: Education and Evolution“Improvements in learning — which correlates with stronger partisanship — and the tendency to choose likeminded mates may be helping to create divided politics.” – from avi tuschman. – h/t eddy elmer!

Conservatives generally more willing to take business risks, study finds

Paternal Age at Childbearing and Offspring Psychiatric and Academic Morbidity“In the study population, advancing paternal age was associated with increased risk of some psychiatric disorders (eg, autism, psychosis, and bipolar disorders) but decreased risk of the other indexes of morbidity.”

A Genotype-First Approach to Defining the Subtypes of a Complex Disease – h/t kevin mitchell who tweeted: “Increasing recog’n that ‘common disorders; like autism really umbrella terms for many rare diseases.”

Researchers look at boy-girl differences in autism“Boys, it seems, can develop autism from a relatively small genetic hit, according to a study published today in the American Journal of Human Genetics. It takes more of a genetic wallop, though, to cause autism in girls – so when they do get it, they’re worse off. The same explanation holds true, researchers think, for the gender imbalance in ADHD (attention-deficit hyperactivity disorder), intellectual disabilities and schizophrenia.” – see also: A Higher Mutational Burden in Females Supports a “Female Protective Model” in Neurodevelopmental Disorders.

China Cracks Down on DNA Testing – h/t jayman!

Epigenetics: The sins of the father – big story in nature today. – “The roots of inheritance may extend beyond the genome, but the mechanisms remain a puzzle.” – but swedish scientist on twitter says: “But Rando misquotes Swedish human data in his Cell paper on mice. Caution for epigenetic hype!” – hmmmm. =/

The Consequences of Natural Morality“Good and Evil are not objective things. They exist as subjective impressions, creating a powerful illusion that they are objective things. This illusion that Good and Evil are objects independent of the conscious minds that imagine them exists for a good reason. It ‘works.’ In other words, its existence has enhanced the probability that the genes responsible for its existence will survive and reproduce.” – from helian.

Digit ratio predicts eminence of Polish actors – this one’s for sisyphean! (^_^) – h/t ben southwood!

Sex differences in color preferences transcend extreme differences in culture and ecology.

In Academia, Women Collaborate Less With Their Same-Sex Juniors“‘Some older women treated us younger women almost worse than some men did,’ she says. ‘We called it the “Queen Bee syndrome.”‘” – heh. – h/t claire lehmann!

Women Can Keep the Vote: No Evidence That Hormonal Changes During the Menstrual Cycle Impact Political and Religious Beliefs – behind paywall.

Women ‘subconsciously outdo other females’ during ovulation“But what the researchers found really surprising is that ovulating women did not appear to want a higher standing over men – they became kinder to them. When playing the dictator game, non-ovulating women shared 45% of their money with men, while ovulating women were willing to share 60% of their money with men. These findings are unlike anything we have ever seen in the dictator game. You just don’t see people giving away more than half of their money,’ says Prof. Durante.” – (~_^)

Women Outperform Men in Ultra-Distance Swimming – The ‘Manhattan Island Marathon Swim’ From 1983 to 2013. – because we float better (because we have that extra layer of fat)? (~_^)

Sameness and the self: philosophical and psychological considerations.“[H]ow can a person maintain a belief in the sameness of self over time in the face of continual psychological and physical change?” – h/t neuroskeptic!

Young Children Can Be Taught Basic Natural Selection Using a Picture-Storybook Intervention – but not politically correct people, apparently. (~_^) – h/t stuart ritchie!

Study: Racial bias in pain perception appears among children as young as 7 – see also: Psychologists use baby-cam to study infants’ exposure to faces.

Mixed-race children ‘are being failed’ in treatment of mental health problems“Children of mixed race are at greater risk of suffering from mental health problems and are not getting the support they need, says a report.” – in the u.k.

Inferring Character From Faces: A Developmental Study.“This research suggests that the predisposition to judge others using scant facial information appears in adultlike forms early in childhood and does not require prolonged social experience.”

Los europeos no inventaron la desigualdad en Hispanoamérica – from eduardo zugasti.

Native American city on the Mississippi was America’s first ‘melting pot’carcosa cahokia. – “By analyzing the teeth of those buried in different locations in Cahokia, Emerson, state archaeological survey bioarchaeologist Kristin Hedman and graduate student Philip Slater discovered that immigrants formed one-third of the population of the city throughout its history (from about AD 1050 through the early 1300s).”

Two-hundred-year drought doomed Indus Valley Civilization“Monsoon hiatus that began 4,200 years ago parallels dry spell that led civilizations to collapse in other regions.”

HBD 101 – from malcolm pollack. (*^_^*)

bonus: A ‘Second Great Wave’ of immigration?“‘Once again, the country is approaching a percentage of foreign-born not seen since the late 1800s and early 1900s,’ the Census Bureau wrote on its blog this week.” – =/ – h/t ray sawhill!

bonus bonus: Muhammad’s birthplace to be razed – remember that the najdis hate the hejazis and vice versa.

bonus bonus bonus: Giant Virus, Awakened From 30,000-Year Slumber, Is Still Infectious – ruh roh (if you’re an amoeba)!

bonus bonus bonus bonus: Crawling Through The Brain Without Getting Lost“Do the wasps taste their way through a cockroach brain?” – mmmmmm! =/

bonus bonus bonus bonus bonus: Australia: Snake eats crocodile after battle – WITH PICTURES! =o – h/t ed west!

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linkfest – 07/08/12

Genes May Play Role in Educational Achievement, Study Finds“Researchers have identified genetic markers that may influence whether a person finishes high school and goes on to college, according to a national longitudinal study of thousands of young Americans…. The three genes identified in the study – DAT1, DRD2 and DRD4 – have been linked to behaviors such as attention regulation, motivation, violence, cognitive skills and intelligence, according to the study.”

Racial bias colours visual perception“Prejudiced people slowest to recognize faces from other races.” – or maybe people who are slowest to recognize faces from other races are the most “prejudiced”?

Cross-national IQ, inequality, and homicide – from the inductivist.

Research shows endowment effect in chimpanzees can be turned on and off“‘These results strongly support the idea that the endowment effect reflects the deep influence of evolutionary processes – notably natural selection – on psychological predispositions that affect how brains ascribe value to objects.'”

A scientific study reveals that individuals cooperate according to their emotional state and their prior experiences“[P]eople do not act thinking in their own reward, as had been previously believed, but rather individuals are more influenced by their own mood at the time and by the number of individuals with whom they have cooperated before.”

Baby makers scorn porn? – from the awesome epigone.

Chronic pain is determined by emotions, scientists believe“The more emotionally the brain reacted to the initial injury, the more likely it was that pain will persist after the injury has healed, he said. Prof Apakarian added: ‘It may be that these sections of the brain are more excited to begin with in certain individuals, or there may be genetic and environmental influences that predispose these brain regions to interact at an excitable level.'”

‘Cat ladies’ more likely to commit suicide, scientists claim“Researchers found women infected with the Toxoplasma gondii (T. gondii) parasite, which is spread through contact with cat faeces or eating undercooked meat or unwashed vegetables, are at increased risk of attempting suicide.”

Autism, schizophrenia and bipolar disorder may share common underlying factors, study suggests“New research led by a medical geneticist at the University of North Carolina School of Medicine points to an increased risk of autism spectrum disorders (ASDs) among individuals whose parents or siblings have been diagnosed with schizophrenia or bipolar disorder.”

O Brother, Who Art Thou? – review of Born Together – Reared Apart: The Landmark Minnesota Twin Study.

23andMe Contributes to Genetic Discoveries Related to Breast Size and Breast Cancer“23andMe … has identified seven single-nucleotide polymorphisms (SNPs) significantly associated with breast size, including three SNPs also correlated with breast cancer in a genome-wide association study (GWAS) now published online in BMC Medical Genetics. These findings make the first concrete genetic link between breast size and breast cancer risks.” – they looked at data from women of european ancestry.

Researchers Find a Brain Center for Social Choices“Poker-playing subjects seen weighing whether to bluff.”

bonus: the higgs! (maybe/probably)

bonus bonus: The ‘appetite-suppressing’ effect of proteins explained

bonus bonus bonus: Plants that feed on animals underground discovered“Three species of carnivorous plant that feed on worms underground have been discovered in the Brazilian savannah.”

bonus bonus bonus bonus: Women ‘deliberately post ugly photos of friends online’ – heh.

bonus bonus bonus bonus bonus: Dogs May Mourn as Deeply as Humans Do – dogs are people, too.

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linkfest – 07/01/12

Racism is Innate: The Human Brain Makes Unconscious Decisions Based on Ethnicity“Racism is hardwired into the brain and operates unconsciously because areas that detect ethnicity and control emotion are closely connected, according to scientists.” – original research article. see also How the brain views race.

CSIC recovers part of the genome of 2 hunter-gatherer individuals from 7,000 years ago“The DNA data, which represent the 1.34% and the 0.5% of both individuals total genome, show that they are not directly connected to current populations of the Iberian Peninsula. Iberians from the Mesolithic Period were closer to current populations of northern Europe, who could have assimilated part of the genetic legacy of these hunters-gatherers.”

Food and Porn as Supernormal Stimuli – from dennis mangan

Pottery 20,000 years old found in a Chinese cave“Pottery fragments found in a south China cave have been confirmed to be 20,000 years old, making them the oldest known pottery in the world, archaeologists say…. The findings … [refute] conventional theories that the invention of pottery correlates to the period about 10,000 years ago when humans moved from being hunter-gathers to farmers.” – original research article.

Steady studs, dysgenic dolls“Jayman found that among black men, the trend is neutral, while a pronounced dysgenic trend exists among black women. The story is similar among whites, although the dysgenic tilt among white women is gentler than it is among black women.” – from mr. a. epigone, esq.

The crayola-fication of the world: How we gave colors names, and it messed with our brains (part I) – read this!

also this!: Your Color Red Really Could Be My Blue“‘I would say recent experiments lead us down a road to the idea that we don’t all see the same colors,’ Neitz said. Another color vision scientist, Joseph Carroll of the Medical College of Wisconsin, took it one step further: ‘I think we can say for certain that people don’t see the same colors….'”

University of Pittsburgh study reveals moderate doses of alcohol increase social bonding in groups – cheers!

bonus: Phylogeny: Rewriting evolution“Tiny molecules called microRNAs are tearing apart traditional ideas about the animal family tree.”

bonus bonus: Low-carb diet burns the most calories in small study

bonus bonus bonus: Mysterious Fairy Circles Are ‘Alive’ – whoa.

bonus bonus bonus bonus: How presidential elections are impacted by a 100 million year old coastline – cool!

bonus bonus bonus bonus bonus: Mumbai doctors remove 12.5cm-long worm from man’s eye – ewwww!

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linkfest – 05/06/12

One gene helped human brains become complex“A single ancestral human gene that made two copies of itself may have helped the evolution of our large brains 2.5 million years ago, as our ancestors were diverging from australopithecines.”

Blonde hair evolved independently in Pacific islands

Humans Really Are Still Evolving, Study Finds“Natural forces of evolution still continue to shape humanity despite the power we have to profoundly alter the world around us, researchers say.” – duh. original research article: Natural and sexual selection in a monogamous historical human population

The Great White Horse“A racial group is a partly inbred extended family. The inbreeding gives races more coherence and persistence than typical extended families.” – from steve sailer.

Blacks more likely to commit hate crimes than white – from the audacious epigone.

Rushton on the skin color/behavior correlation“[T]he theory that genes explain the worldwide correlation between skin tone and important behaviors” – from the inductivist.

HBD and Atheism – from jayman.

HBD and policy: Which questions to ask? – from m.g. @the hbdday blog!

World’s Oldest Blood Found in Famed “Iceman” Mummy

Amish farm kids remarkably immune to allergies: study

9-Month-Olds Show Racial Bias When Looking at Faces“‘These results suggest that biases in face recognition and perception begin in preverbal infants, well before concepts about race are formed.'”

Study: Aversion to the smell of meat may be genetic“[P]eople who have two copies of a particular odour receptor gene variant [OR7D4 RT] are more likely to find the smell of a hormone that occurs in pork unpleasant.”

Did Ancient Germans Steal the Pharaoh’s Chair Design?“Roughly 3,500 years ago, folding chairs remarkably similar to ones found in Egypt suddenly became must-have items in parts of northern Europe.”

‘Inhabitants of Madrid’ ate elephants’ meat and bone marrow 80,000 years ago

bonus: Dark Matter May Collide With Atoms Inside You More Often Than Thought – ouch!

bonus bonus: Scientific Evidence Proves why Healers See the “Aura” of People – synesthesia.

bonus bonus bonus: Are Educators Showing A “Positive Bias” To Minority Students – and Keeping Them From Doing Their Best?

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