linkfest – 11/16/14

look! a linkfest! (^_^)

Bayesian analyses of Yemeni mitochondrial genomes suggest multiple migration events with Africa and Western Eurasia

37,000-year-old Russian skeleton has Neanderthal DNA that’s gone missing“Sequences present in its genome haven’t been found in modern human populations.” – see also Remix from greg cochran. – see also Genome of Kostenki-14, an Upper Paleolithic European (Seguin-Orlando, Korneliussen, Sikora, et al. 2014) from dienekes.

Humans Would Beat Neanderthals in Marathon

Different Ways to Color a Cat – from razib. – h/t billare! who tweeted: “Progenitors of modern Europeans were fairly light-skinned–why did a 2nd bout of selection leave its tell-tale marks?”

Admixture in the Americas: Introduction, partial correlations and IQ predictions based on ancestry – from emil kirkegaard.

Our Futile Efforts to Boost Children’s IQ“How can parenting and socioeconomic status play such minor roles in determining IQ, when scholars on all sides of the nature-nurture debate agree that somewhere around half of the variation in IQ is environmental? The short answer is that the environment that affects IQ doesn’t consist of the advantages that most people have in mind — parents who talk a lot to their toddlers, many books in in the house for the older children, high-quality schools and the like. Instead, studies over the past two decades have consistently found that an amorphous thing called the “nonshared” environment accounts for most (in many studies, nearly all) of the environmentally grounded variation. Scholars are still trying to figure out what features of the nonshared environment are important. Peers? Events in the womb? Accidents? We can be sure only of this: The nonshared environment does not lend itself to policy interventions intended to affect education, parenting, income or family structure.” – from charles murray. – h/t mr. mangan, esq!

Results of a “GWAS Plus:” General Cognitive Ability Is Substantially Heritable and Massively Polygenic – h/t emil kirkegaard!

Does neural crest development drive domestication syndrome?“Altered neural crest development could be the reason mammals change in oddly consistent ways during domestication. As first noted by Darwin more than 140 years ago, domestic mammals tend to share certain characteristics—a suite of traits called the domestication syndrome.”

‘Darwin’s Dilemma’ May Be Solved“Scientists following two different lines of evidence have just published research that may help resolve ‘Darwin’s dilemma,’ a mystery that plagued the father of evolution until his death more than a century ago. Biologists and geologists have been puzzled for decades over why life began so early on this planet, and then took so long to get interesting.”

A new study pieces together the puzzle of insect evolution“A new study of insect evolution — the largest of its kind ever undertaken — has uncovered some surprising new information, confirmed some long-held hypotheses and may lead researchers toward a more comprehensive understanding of evolution. One hundred scientists from 10 countries worked together to examine 144 insect species. Their goal was to create an insect ‘family tree’ and establish a timeline of insect evolution. Their results were published recently in the journal Science.” – cool!

More evidence that certain versions of some genes can encourage violence

Facial structure predicts goals, fouls among World Cup soccer players“The scientists studied the facial-width-to-height ratio (FHWR) of about 1,000 players from 32 countries who competed in the 2010 World Cup. The results, published in the journal Adaptive Human Behavior and Physiology, showed that midfielders, who play both offense and defense, and forwards, who lead the offense, with higher FWHRs were more likely to commit fouls. Forwards with higher FWHRs also were more likely to score goals or make assists.”

Mental health: Depression needs large human-genetics studies“To understand the molecular mechanisms of depression, collect genetic data from more than 100,000 people, says Steven Hyman.”

Geneticists tap human knockouts“On average, every person carries mutations that inactivate at least one copy of 200 or so genes and both copies of around 20 genes.”

The Inexorable Progress of Science: Archaeology“With a very limited set of clues, smart guys managed to get key facts about European prehistory roughly correct almost 90 years ago . With tremendously better tools, better methods, vastly more money, more data, etc, archaeologists (most of them) drifted farther and farther from the truth.” – from greg cochran.

How Your Facebook Updates Reveal Your Personality“Extroverts tend to use words like love, tonight, party, excited and amazing. Several length variants of the word soooo and ‘text speak’ terms like lovin and ur, are more often found on extroverts’ updates. In general the extrovert word cloud is sloppy enough to make any ‘Grammar Nazi’ red in the face. When we come to introverts, use of the word computer was one of the biggest giveaways. Posting status updates about Internet, and to a lesser extent anime, doctor who, and books, were also predictive of introversion.” – from neuroskeptic.

The contribution of additive genetic variation to personality variation: heritability of personality“[W]e found that approximately 52% of animal personality variation was attributable to additive genetic variation.”

The genetics of impulsivity: evidence for the heritability of delay discounting – h/t ben southwood! who tweeted: “Impulsivity is 55% heritable at age 18.”

We are not equally empathic – from peter frost.

He’s Definitely a Liberal—Just Check Out His Brain Scan“[W]e’ve had solid indications for a while now that our ideological biases are based, in large part, on the biology of our brains…. Of course, we’d like to think we came to our core beliefs through a process of rational reflection and discussion — or, at the very least, as a psychological reaction to the influence of our parents and peers…. But the profound influence of basic brain biology has just been re-affirmed in a new research paper, which found liberals and conservatives can be easily identified through fMRI scans…. ‘Remarkably,’ writes a team led by P. Read Montague of the Virginia Tech Carilion Research Institute, ‘brain responses to a single disgusting stimulus were sufficient to make accurate predictions about an individual subject’s political ideology.'”

The Most Heritable Gut Bacterium is… Wait, What is That?“By studying 416 pairs of British twins, Julia Goodrich and colleagues from Cornell University have identified the gut microbes whose presence is most strongly affected by our genes.”

Microbiome science threatened by contamination“Non-sterile sequencing returns rogue results in dilute microbe samples.”

Global IQ and health – from dr. james thompson.

Book Review: The Ten Thousand Year Explosion (2009) by Greg Cochran and Henry Harpending – from staffan.

The ecology of religious beliefs“Both comparative and experimental evidence indicate that beliefs in moralizing high gods promote cooperation among humans, a behavioral attribute known to correlate with environmental harshness in nonhuman animals. Here we combine fine-grained bioclimatic data with the latest statistical tools from ecology and the social sciences to evaluate the potential effects of environmental forces, language history, and culture on the global distribution of belief in moralizing high gods (n = 583 societies). After simultaneously accounting for potential nonindependence among societies because of shared ancestry and cultural diffusion, we find that these beliefs are more prevalent among societies that inhabit poorer environments and are more prone to ecological duress.”

Edvard Westermarck on Morality: The Light Before the Darkness Fell and Post-Darwinian, “Evolutional” Theories of Morality in the 19th Century – from helian.

Genes contribute to behavior differences between fierce and friendly rats“Genes active in the brain implicated in differences in rats selected for aggression or tameness”

Intimidating chimpanzee males are more likely to become fathers – ruh roh. – h/t steve stewart williams!

Marriage Records Reveal Patterns of Korean Migration Through the Centuries

What Edward Luttwak Doesn’t Know About Ancient China (Or a Short History of Han-Xiongnu Relations), pt. 1 and What Edward Luttwak Doesn’t Know About Ancient China (Or a Short History of Han-Xiongnu Relations), pt. 2 – from t.greer.

There’s Something About Teutonics – from those who can see.

An extremely low-density human population exterminated New Zealand moa“Here we show that the Polynesian population of New Zealand would not have exceeded 2,000 individuals before extinction of moa populations in the habitable areas of the eastern South Island. During a brief (<150 years) period and at population densities that never exceeded ~0.01 km(-2), Polynesians exterminated viable populations of moa by hunting and removal of habitat. High human population densities are not required in models of megafaunal extinction."

A Gene by Any Other Name“What is the logic in naming human genes?”

bonus: Keeping Mates Close and Competition Out in an Ocean Sponge

bonus bonus: Here’s Why Other People’s Farts Smell Way Worse Than Your Own – we cover *all* aspects of human biodiversity here on the hbd chick blog! (~_^)

(note: comments do not require an email. an ocean sponge.)


random notes: 06/07/14

here’re some random notes on the history of mating patterns in korea!:

from Marriage, Social Status, and Family Succession in Medieval Korea (Thirteenth-Fifteenth Centuries) [pg. 133 – links added by me]:

“Marriage between those with the same surname and the same family origin was prohibited by law since the early Koryô Dynasty [918–1392]. Prohibition orders were issued twelve times throughout the Koryô Dynasty. It was the goal to expand the range of prohibited marriages from a first cousin in 1058 to a second cousin in 1096. Marriage among those with the same surnames was also prohibited in 1309. Because of the prohibition order in 1309, intermarriage between Kwôn families decreased rapidly from about 35 percent to less than 5 percent in the mid-fourteenth century (Figure 4).

“There were, however, cases of marriage between those with the same surname and the same family origin, even up to the Chosôn Dynasty [1392–1897]. In the years 1606 and 1630, in the Saneum Household Register, intermarriage was recorded at 5.9 percent and 5.8 percent respectively.”

so, first cousin marriage was banned in 1058, second cousin marriage in 1096, and marriage to all cousins from the patriclan in 1309. however, note that the first and second cousin marriage bans were also cousins from the patriclan, so marriages to the mother’s brother’s daughter (mbd) or father’s sister’s daughter (fzd), neither of whom would share a male ego’s surname, were still permitted — and were practiced. (mbd marriage is quite typical for east asia, especially in china traditionally.)

the dates of the bans on cousin marriage are a few hundred years after northwest europe — ca. 500 a.d. versus ca. 1000 ad. plus, of course, the catholic church in europe banned marriage to all forms of cousins, not just those of the same patriclan. the rates of cousin marriage in the 1600s in korea are very low — not much higher than, say, the upper classes in england in the nineteenth century — but, again, marriages to the mbd or fzd are not included in these figures.

from Forbidden Relatives: The American Myth of Cousin Marriage [pg. 10]:

“In Korea, for example, traditional matrimonial rules forbid marriage between a man and a type of second cousin (the daughter of his grandfather’s brother’s son’s daughter) but allow a man to wed a kind of first cousin (the daughter of his mother’s brother).”

this is, of course, because the second cousin is from the patriclan (shares the same surname as the man), whereas the first cousin is not.

and from Voices of Foreign Brides: The Roots and Development of Multiculturalism in Korea [pgs. 28 and 171 – links added by me]:

“Historically, most Korean dynasties imposed the incest taboo. In Koguryo (37 BC to AD 668) and Paekche (18 BC to AD 660), marriage within the same lineage (or clan) was prohibited, while Silla (57 BC to AD 935) encouraged close kin marriages beyond the third degree of relationship (beyond uncle and aunt) and with members of the same clan, especially among royal and upper-class families. In the early dynastic period, Koguryo followed the Silla system, allowing close kin marriage even within a two-degree relationship (even brother and sister, if the mothers were different) in royal families as an effort to maintain the ‘same blood’ and protect the purity of the royal blood line. In fact, King T’aejo of the Koguryo dynasty encouraged close-kin marriage.”

so before the bans of ca. 1000 a.d. mentioned above, close cousin marriage of all sorts was present in large parts of the korean peninsula.

“The prohibition of marriage between members of the same lineage or clan…. This taboo rule had come into being in the Choson dynasty after the adoption of Ta Ming Lu (Law of the Great Ming), the comprehensive body of administrative and criminal law of the Ming dynasty (1368-1644) of China.”

i think the law of the great ming was adopted in korea around 1397 [pg. 21], although the source above says that marriage within the patriclan was banned in 1309.

“Nevertheless, *yangban* [members of the ruling class – h.chick] in many cases ignored the rule and continued to marry matrilineal cousins (siblings of a mother’s sisters and father’s sisters).”

well, that shouldn’t have been a problem, since those cousins do not have the same surname/are not part of the patriclan.

“In Korea, unlike China, several different clans may share one *song*, and clans with different surnames may share a *pon*, in which case the rule of clan exogamy is applied…. Under this rule, some clans with millions of members have been prohibited from intermarrying….”

again, this is the patriclan. some footnotes from Voices of Foreign Brides:

“13. Kim, Kimchi and IT, p. 113. And rules regulating marriage customs, specifically those prohibiting marriage between close relatives, were first initiated by the tenth king of the Koryo dynasty (918-1392), Chongjong (1034-1046). During his reign, the children of close kin marriages could not be appointed to government positions. Nevertheless, such a prohibition mainly had an impact on upper-class nobility and not commoners. Some believe that such a rule reflected the influence of China, but others disagree. If Koryo was either forced to initiate or willingly adopted the Chinese system, the incest taboo might have extended to entire surname groups as in China. Instead, Koryo merely imposed a prohibition of marriage between close relatives (ibid.; Lee, Han’guk kajok-ui sajok yon gu, pp. 64-65).

“14. Martina Deuchler offers an explanation for the adoption of this law (Martina Deuchler, “The Tradition: Women during the Yi dynasty,” in Virtues in Conflict: Tradition and the Korean Women Today, Sandra Mattielli, ed., pp. 1-47 [Seoul: The Royal Asiatic Society, Korea Branch, 1977], p. 4). The Choson literati-official (*sadaebu*) became aware that indigenous Choson customs often stood in the way of implementing reform policies, which could not be carried out successfully without legal sanctions (Kim, Kimchi and IT, p. 113). The adoption of the Ta Ming Lu was therefore an introduction of the rule of law to supplement the rule of goodness. However, Choson interpreted the entire Ta Ming Lu so literally that lineage and clan exogamy, the rule of marriage that requires a person to marry outside his or her own group, was institutionalized in Korea….

“16. In July 1977, however, the constitutional Court of Korea handed down a landmark decision ruling that prohibition of marriage between clan members beyond eight-degree relationships (third cousins) was unconstitutional. Since then, clan members whose kinship was beyond eight degrees could marry legitimately, and family registries could issue marriage licenses for such couples…. A court ruling handed down on February 3, 2005, followed by the passage of a new statute on March 2, 2005, changed the system of giving surnames. This is turn has altered clan exogamy.”

(note: comments do not require an email. traditional korean dress. the friggin’ BEST traditional dresses in ANY culture! (^_^))