Archives for posts with tag: cognitive abilities

The human migration out of Africa left its mark in mutations“The farther from Africa, the more of them there are.” – h/t billare! – see also: Distance from sub-Saharan Africa predicts mutational load in diverse human genomes.

Genomic Evidence Establishes Anatolia as the Source of the European Neolithic Gene Pool“Kum6 shows a strong population continuity with present-day Sardinia. Kum6 expresses connections to the central Eurasian gene pool. Kum6 shares notable affinity with the Iceman, a 5,300-year-old southern European. Genetic affinities to both East and West suggest continuous contact with Anatolia.”

Ancient Irish had Middle Eastern ancestry, study reveals“Genetic researchers find evidence of mass migration to Ireland thousands of years ago.” – see also: Neolithic and Bronze Age migration to Ireland and establishment of the insular Atlantic genome. and see also from razib: The Gaels Were from Scythia. and from dienekes: Bronze Age people from Ireland had steppe ancestry and R1b. – (my mtDNA hapologroup [more here] — H13a1a — is rather rare in ireland, but is most common in daghestan and may have arisen there. the parent group H originated in the near east.)

The Residents of Vanuatu, Then and Now“Analysis of skulls in the oldest known cemetery in the South Pacific suggests that the earliest inhabitants of Vanuatu may have descended from Asian and Polynesian populations, while modern residents share more physical similarities with people in Melanesia.”

The evolution of the age at menarche from pre-historical to modern times“Data from skeletal remains suggest that in the Paleolithic female menarche occurred at an age between 7 and 13 years, early sexual maturation being a trade-off for reduced life expectancy. In the classical, as well as in the medieval years, the age at menarche was generally reported to be at about 14 years, with a range from 12-15 years. A significant retardation of the age at menarche occurred in the beginning of the modern times, soon after the industrial revolution, due to the deterioration of the living conditions, most studies reporting menarche to occur at 15-16 years. In the 20th century, especially in the second half of it, in the industrialized countries, the age at menarche decreased significantly, as a result of the improvement of the socioeconomic conditions, occurring between 12-13 years. In the present times, in the developed countries, this trend seems to slow down or level-off.” – h/t neuroskeptic!

Why parenting may not matter and why most social science research is probably wrong and How to Find a Parenting Effect – from brian boutwell! – from the first article: “Whether it’s a study purporting to link some aspect of parenting to child development, or a study intended to link some new diet fad to weight loss, the results are unclear if they did not control for genetics. Lest someone put words into my mouth later, this does *not* mean that every correlation reported by social scientists is the result of correlated genetic influences. The point, however, is that we have spent decades churning out correlations and we have no idea whether the findings were polluted by unmeasured genetic factors. That’s frightening, especially since public policies have been built on some of these potentially illusory correlations. The standard way of doing business in the social sciences ignores genetic influences, and has for years. Be careful which findings you cling to. Most social science research can only reveal associations; which is important, no doubt, but I presume you want to know something about causality also (i.e., if you eat bacon everyday what’s the chance that it’ll *cause* you to get cancer; that sort of thing). To even begin approximating causality (assuming you cannot do an experiment, which you can’t with most social science research), you must account for all confounding factors—genes included.”

Discontinuity in the genetic and environmental causes of the intellectual disability spectrum“[O]ur results suggest that most severe ID is a distinct condition, qualitatively different from the preponderance of ID, which, in turn, represents the low extreme of the normal distribution of intelligence.”

Heritability of autism spectrum disorders: a meta-analysis of twin studies – between 64-91%.

Progress and promise in understanding the genetic basis of common diseases

The Concordance and Heritability of Type 2 Diabetes in 34,166 Twin Pairs From International Twin Registers: The Discordant Twin (DISCOTWIN) Consortium – h/t amir sarislan! who tweeted: “Heritability of Type 2 Diabetes 72% (95% CI: 61–78%).”

Clinical Genetics Has a Big Problem That’s Affecting People’s Lives“Unreliable research can lead families to make health decisions they might regret.”

Schizophrenia and violence“[T]here are startling new results from a large, representative sample of Norwegians [swedes, i think-h.chick], showing that the rate of violence is about 7 times higher in schizophrenics as compared to controls, and 3 times higher for those with bi-polar disorder.” – from dr. james thompson.

How Time Preferences Differ: Evidence from 53 Countries“Time discounting correlates with innovation, environmental protection, innovation, etc.” – h/t rolf degen!

Personality, cognitive/psychological traits and psychiatric resilience: A multivariate twin study“Neuroticism evidenced the largest phenotypic and genetic relationship with resilience, and accounted for nearly all of the phenotypic and genetic variance between resilience and the other traits.”

Polls and Elections Some Folks You Just Can’t Reach: The Genetic Heritability of Presidential Approval“The model is tested using twin data to estimate the genetic heritability of presidential performance evaluations and finds that presidential approval has a strong genetic component.” – h/t andrew sabisky!

Status Decreases Dominance in the West but Increases Dominance in the East“Across two experiments, having high status decreased punishment by American participants but increased punishment by Chinese and Indian participants. Moreover, within each culture, the effect of status on punishment was mediated by feelings of being respected. A final experiment found differential effects of status on punishment imposed by Asian Americans depending on whether their Asian or American identity was activated.” – h/t timothy bates!

Assortative Mating for Educational Level in Parents of Public School Children (N > 7000 Individuals) in the Lagos State, Nigeria“Approximately 61.5 % of the parents had spouses at the same level of education. More mothers than fathers married upward in educational level. The assortative mating coefficients for educational level were .52–.61 across respondents’ classes, .51–.62 across six school districts, and .57 (.55–.59) in the total sample. Overall, these results were very similar to the findings from Western or Asian samples, providing evidence to support the robustness of human mating pattern in educational attainment across different cultures and ethnic groups.”

‘The Bell Curve’ 20 years later: A Q&A with Charles Murray“The lesson, subsequently administered to James Watson of DNA fame, is that if you say it is likely that there is *any* genetic component to the black-white difference in test scores, the roof crashes in on you. On this score, the roof is about to crash in on those who insist on a purely environmental explanation of all sorts of ethnic differences, not just intelligence. Since the decoding of the genome, it has been securely established that race is not a social construct, evolution continued long after humans left Africa along different paths in different parts of the world, and recent evolution involves cognitive as well as physiological functioning.”

Why Some of the Worst Attacks on Social Science Have Come From Liberals“In the halls of social-science academia, where liberals [have a numerical advantage], it’s telling that some of the same sorts of feeding frenzies occur. This should stand as a wake-up call, as a rebuke to the smugness that sometimes infects progressive beliefs about who ‘respects’ science more. After all, what both the Bailey and Chagnon cases have in common — alongside some of the others in Galileo’s Middle Finger — is the extent to which groups of progressive self-appointed defenders of social justice banded together to launch full-throated assaults on legitimate science, and the extent to which these attacks were abetted by left-leaning academic institutions and activists too scared to stand up to the attackers, often out of a fear of being lumped in with those being attacked, or of being accused of wobbly allyship.”

Small families are better for kids, new research says – hmmmm. – see also: The Quantity-Quality Trade-Off And The Formation Of Cognitive And Non-Cognitive Skills.

edge question 2016: What Do You Consider The Most Interesting Recent [Scientific] News? What Makes It Important? – john tooby’s response: The Race Between Genetic Meltdown and Germline Engineering. – h/t steve stewart williams!

Oldest Hoabinhian site discovered in SW China“The oldest Hoabinhian culture, an important technological adaptation by hunter-gatherers to the humid tropical and subtropical environments of southeast Asia some 43,500 years ago, was identified in southwest China’s Yunnan Province. Discovered at Xiaodong Rockshelter, it is the first-ever Hoabinhian site to be found in China, according to a research team at the Yunnan Institute of Cultural Relics and Archaeology.”

Palaeolithic stone tools found in Iranian Kurdistan

bonus: Do Dogs Know Other Dogs Are Dogs?“This is not a philosophical riddle. Despite their highly variable appearance, dogs can recognize each other by sight alone.” – woof!

bonus bonus: Carrie Fisher: I had sex with Princess Leia fans – what happens at comic-con STAYS at comic-con! (~_^) – h/t razib!

and the tweet of the (last) week…! (~_^)

(note: comments do not require an email. carrie fisher. you’re welcome! (~_^) )

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It Must Be Said“There are facts that were once known, sometimes generally known, that are now known to but a few…. Many people assume that everyone is secretly aware of those unpleasant facts, but that is not the case. A generation that has grown up never hearing those facts will be almost entirely unaware of them, in part because their personal life experiences don’t impinge on those patterns much…. Anyhow, I intend to occasionally make a clear statement of some hateful fact – not necessarily because I have anything new to say on the subject (which is what I prefer). Someone has to corrupt the rising generations.” (^_^) – from greg cochran.

White Men Can’t Reach“‘[S]ports will continue to provide a splendid stage for the fantastic menagerie that’s human biological diversity. Amid the pageantry of the Opening Ceremony of the 2016 Olympics in Rio de Janeiro, make sure to look for the extremes of the human physique…. It is breathtaking to think that, in the truest genetic sense, we are all a large family, and that the paths of our ancestors have left us wonderfully distinct.'” – *sniff* – steve sailer reviews david epstein’s The Sports Gene.

Why We Can’t Talk About IQ“This is how we are: jumbles of superstition, emotion, self-deception, and social conformism, with reason and science trotting along behind trying to keep up.” – from the derb.

Evolution of monogamy in humans the result of infanticide risk“The threat of infants being killed by unrelated males is the key driver of monogamy in humans and other primates.”

European Hunter-Gatherers Had Domesticated Pigs Earlier Than Thought“Domesticated pigs were present in northern Germany around 4600 B.C., some 500 years earlier than previously thought, new fossil and DNA evidence reveals.”

Hidden shell middens reveal ancient human presence in Bolivian Amazon“Previously unknown archeological sites in forest islands reveal human presence in the western Amazon as early as 10,000 years ago….”

Mycobacterium tuberculosis: Our African follower for over 70,000 years!“The researchers compared the genetic evolutionary trees of mycobacteria and humans side-by-side. And to the researcher’s surprise, the phylogenetic trees of humans and the TB bacteria showed a very close match. ‘The evolutionary path of humans and the TB bacteria shows striking similarities….'”

Human Microbiome May Be Seeded Before Birth

You Are Your Bacteria: How the Gut Microbiome Influences Health“The bacteria in our gut already plays an important role in digestion. But new studies indicate that our bacteria could play a major role in whether or not we become obese.”

Edinburgh is surprise capital of redheaded Britain and Ireland“The Edinburgh area is the most red headed region, according to the study, with 40 per cent of the population carrying one of the three common red hair gene variants.” – i love red hair! there’s a map here.

Live fast, die young – from mr. mangan, esq. see also: Single Gene Change Increases Mouse Lifespan by 20 Percent and Biologists May Have Identified Gene Central to Development, Reproduction and Aging – h/t hbd bibliography, here and here!

Is war really disappearing? A new analysis suggests not“Countries may simply have less ability to fight.”

Men feel worse about themselves when female partners succeed

Are You Smarter Than You Think?“The evolved wisdom behind our seemingly stupid decisions…. [B]iases are often not as stupid as psychologists like to make them out to be.” – h/t jason collins!

Poverty Saps the Brain’s Mental Reserves“The mere circumstance of being poor can reduce a person’s cognitive abilities by consuming precious mental resources.”

DNA Methylation: Are Your Genes Turned On?

Personal space: how close is too close?“Scientists have determined what the absolute limit is for invading other people’s personal space. … between eight and 16 inches from our faces.” – back off! (~_^)

Your spouse’s voice is easier to hear — and easier to ignore (~_^)

HBD Proponents, Racists and Racialists – some criticism of hbd-ers. i say that the study of human biodiversity can be a force for good! (^_^)

A Discussion On Race, Crime And The Inconvenient Facts

Live by the Sword – a review of The Faithful Executioner: Life and Death, Honour and Shame in the Turbulent Sixteenth Century, a new book about frantz schmidt.

bonus: Counter-Currents Interview of chip of the hoover hog!

bonus bonus: Mind meld? Scientist uses his brain to control another guy’s finger – freaky! (but in a good way. (^_^) )

bonus bonus bonus: These Two Ancient Roman Techs Could Disrupt Modern Industry – h/t nelson!

bonus bonus bonus bonus: A Short Guide To The Middle East – @the assistant village idiot’s!

bonus bonus bonus bonus bonus: 20 Seconds of Tetris Madness (O_O)

bonus bonus bonus bonus bonus bonus: Vote reveals the 50 funniest one-liners ever“‘I went to a restaurant that serves “breakfast at any time”. So I ordered French Toast during the Renaissance.’ – Peter Kay; ‘I believe in equality. Equality for everybody. No matter how stupid they are or how superior I am to them.’ – Steve Martin.” (~_^)

(note: comments do not require an email. any excuse to link to this! (^_^))