Paolo Shirasi @PaoloShirasi
I tweet links to research published in peer-reviewed scientific journals on human intelligence and other psychological traits. Joined October 2021-
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"We found little support for the idea that psychological sex differences will vanish as societies develop... Instead, it appears that the dominant feature of psychological sex differences is their robustness in the face of social change." theconversation.com/sex-difference…
"Taken together with increases in IQ throughout the 20th century, these secular trends in [larger] brain volume may contribute to greater cognitive resilience." jamanetwork.com/journals/jaman…
How often is a pair of individuals from one race genetically more dissimilar than two individuals chosen from two different races? If genetic similarity is measured over many thousands of loci, the answer becomes “never”. ncbi.nlm.nih.gov/pmc/articles/P…
“If differences in mental abilities are inherited, and if success requires those abilities, and if earnings and prestige depend on success, then social standing... will be based to some extent on inherited differences among people.” static1.squarespace.com/static/538634a…
"In modern era Great Britain, genetic effects contribute towards some of the observed socioeconomic inequalities." The study (using a sample of 286,301 participants from UK Biobank) identified 30 independent-loci associated with income. nature.com/articles/s4146…
Self-control is about 60% heritable, according to this meta-analysis of 31 studies. sciencedirect.com/science/articl…
"Psychology students do not simply lack a proper background in the science of intelligence, but instead (and worse), have been exposed to superficial (but often dogmatic), outdated, and misleading claims." sciencedirect.com/science/articl…
“A study using fMRI (functional magnetic resonance imaging) data to estimate IQ achieves a correlation of 0.68 with intelligence scores.” biorxiv.org/content/10.110…
"This review considers the potential utility of [genetic] ancestry studies to... gain insight into the genetic underpinnings of [racially-unequal sleep patterns]." ncbi.nlm.nih.gov/pmc/articles/P…
Twin studies typically find that the heritability of income in Western countries is 40-45%. link.springer.com/article/10.100…
GWAS research found genetic links between poor math ability and most psychiatric disorders. Links between strong language ability and schizophrenia and employment in creative professions were also found. nature.com/articles/s4159…
"Social race and genetic ancestry are nearly interchangeable." openpsych.net/paper/65/
"According to a meta-analysis on data from 24 genetically informative studies, up to 50% of the total variance in aggressive behavior is explained by genetic influences." jax.org/news-and-insig…
"When parents’ genetics affect their children’s environments, these two modes of inheritance can produce an ‘indirect genetic effect’. Such indirect genetic effects may account for up to half of the estimated genetic variance in educational attainment." nature.com/articles/s4156…
"We report strong evidence of familial clustering of sexual offending, primarily accounted for by genes rather than shared environmental influences." academic.oup.com/ije/article/44…
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Public policy discourse would look rather different if more people took the “genetic lottery” and its implications more seriously
Self-control is about 60% heritable, according to this meta-analysis of 31 studies. sciencedirect.com/science/articl…
@PaoloShirasi "Individuals with high self-control are happier, healthier, and wealthier across adolescence and adulthood. Low self-control has been associated with lack of success in school, relationships, and the labor market."
@PaoloShirasi 2018? Has this been peer reviewed in the meantime? Seems hard to believe with .68
@PaoloShirasi @jordanbpeterson once told of a test- I believe using the older PET scan of the frontal lobes where the higher the IQ score, the less activity they read while solving cognitive problems faster. We’ve known for years you can literally “see” intelligence with scans.
@PaoloShirasi My husband, daughter, and I all hold IQ > 140. We are not Ashkenazi, but hail from regions similar to Ashkenazi. I have IQ (Mensa Admitted) and genetic tests to verify. I originally commenced such testing due to adoption in my family
@PaoloShirasi @eyeslasho But "90% successful" leaves plenty of room for arguments about outliers.
@PaoloShirasi No difference - was the enlightened view until a few years ago (see below). Then , there's a difference, but males identifying as women have "female brains". Where are we now ?
@PaoloShirasi Yes but SNP heritability derived from GWAS is only 1-4%. researchgate.net/publication/37…
Engineers tend to be smart and sane. Fiction writers tend to be creative and crazy. Sounds like a stereotype, which of course is evidence that the researchers are onto something true.
GWAS research found genetic links between poor math ability and most psychiatric disorders. Links between strong language ability and schizophrenia and employment in creative professions were also found. nature.com/articles/s4159…
@adaptonal @PaoloShirasi Ability tilt is very difficult to measure well using online samples.
@PaoloShirasi Speculative detiails emilkirkegaard.com/p/the-verbal-t…
@PaoloShirasi And it is because of the intrinsic behavioral habits of certain groups that studying OCEAN, like intelligence, today is quietly avoided in the social sciences. Why? Because the Big Five personality traits originate in our genes. bityl.co/OmHc
@engmac18 @Odecahedron x.com/paoloshirasi/s…
“We predicted genetic ancestry from rs-fMRI connectivity data at very high performance... Thereby, we demonstrated that genetic ancestry is encoded in the functional connectivity pattern of the brain at rest.” biorxiv.org/content/biorxi…
@PaoloShirasi "This suggests that complex verbal and non-verbal cognitive skills originate developmentaly in early receptive language."
@PaoloShirasi Surely a coincidence! You may find my blog useful geneticchoiceproject.com
Not quite. “However, I do not think that average national IQs are worthless. They do correlate with many important national-level variables (Jones, 2016; Rindermann, 2018).”
An excellent discussion by @Russwarne of why the African national IQ estimates provided by Richard Lynn and others are of limited value. "It would be simplistic to take these scores at face value." russellwarne.com/2020/07/19/tho…
Ashkenazi Jewish - white gentiles gap is already, at age 4, 6 points, and due to increase in verbal IQ, grows to 13 p by adulthood. This holds for boys & girls, bi-linguals, low and high SES & religous vs. atheist Ashkenazim - but not Mizrahi or Sephardi Jews.
In their book The Black-White Test Score Gap (1998), Christopher Jencks and Meredith Phillips argued that the 1 SD (approximately 15-point) black-white IQ gap appears by age three and remains stable throughout the school years. amazon.com/Black-White-Te…
Some thoughts on the recent controversy. 🧵 science.org/content/articl…
Any single figure visualization of global genetic diversity is likely to mislead. Below, I show a familiar V-shaped PCA I recently did, which shows a couple of ~31kya North Siberians (Sikora, Pitulko, et al. 2019) in the context of world genetic variation.
Trends for United States
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