Paolo Shirasi @PaoloShirasi Twitter profile

Pinned Tweet

Paolo Shirasi

@PaoloShirasi

2 years

Some threads and notable studies I've tweeted are nested under this pinned tweet.

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Paolo Shirasi

@PaoloShirasi

5 months

Results of IQ testing of children in the Minnesota Transracial adoption study. Children of various races were adopted at an early age and raised by upper middle-class white parents. IQ of adopted white kids at age 17: 106. IQ of adopted black kids at age 17: 89.

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Paolo Shirasi

@PaoloShirasi

5 months

Thread on size of race IQ gaps. Examples: — 9 out of 10 US Asians have higher IQ than average US black — 1 in 200 northeast Asians have an IQ of 145, but only 1 in 85,000 blacks do — 10% of blacks are below intellectual disability level (70 IQ), but only 1% of US Asians are

Paolo Shirasi

@PaoloShirasi

2 years

Almost no one in intelligence research believes all racial groups have the same average IQ. The (overwhelmingly left-wing) American Psychological Association has explicitly stated that the black-white IQ gap is one standard deviation (a 15-point difference).

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Paolo Shirasi

@PaoloShirasi

1 year

Studies have found childhood IQ correlations of .88 (or greater) for identical twins raised in the same family. But siblings who are raised in the same family who are not related to each other (as in the case of adoptive siblings) have a correlation of only .04 by adulthood.

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Paolo Shirasi

@PaoloShirasi

2 years

The average black 17-year-old student is less proficient in mathematics and reading than the average white 13-year-old.

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Paolo Shirasi

@PaoloShirasi

1 year

The association between low IQ and violence is well-established, but, as this graph shows, the difference in the incidence of physically violent behavior between persons of low intelligence and those of moderately-high intelligence is stark: It's a twelve times difference.

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Paolo Shirasi

@PaoloShirasi

5 months

@Aiden_Revival You can't possibly be serious.

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Paolo Shirasi

@PaoloShirasi

4 months

"Over the last 50 years... evidence has accumulated that only about 10% of school achievement can be attributed to schools and teachers while the remaining 90% is due to characteristics associated with students."

Education and Intelligence: Pity the Poor Teacher because Student Characteristics are more Signif...

Education and Intelligence: Pity the Poor Teacher because Student Characteristics are more Significant than Teachers or Schools - Volume 19

www.cambridge.org

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Paolo Shirasi

@PaoloShirasi

6 months

“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.”

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Paolo Shirasi

@PaoloShirasi

6 months

The IQs of children who had been adopted was much more highly correlated with the IQs of their biological parents than with their adoptive parents — this was true both when they were teenagers and when they were adults.

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Paolo Shirasi

@PaoloShirasi

1 year

A study involving nearly one million adolescents across 78 countries found that boys tend to be happier than girls, and, paradoxically, this gender gap in happiness is widest in societies that have the strongest commitment to gender equality.

The Equality Paradox: Gender Equality Intensifies Male Advantages in Adolescent Subjective Well-B...

Individuals’ subjective well-being (SWB) is an important marker of development and social progress. As psychological health issues often begin during adolescenc...

journals.sagepub.com

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Paolo Shirasi

@PaoloShirasi

8 months

A male does not acquire the impulse control level of a 10 year-old female until around the age of 25. "Males increase in impulse control more gradually than females."

Sex differences in the developmental trajectories of impulse control and sensation-seeking from...

It has been proposed that high rates of risk-taking in adolescence are partly attributable to patterns of neurobiological development that promote an increase in sensation-seeking tendencies at a...

pubmed.ncbi.nlm.nih.gov

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Paolo Shirasi

@PaoloShirasi

4 months

Peoples et al (1995): "Racial differences in intelligence show up by three years of age, even after controlling for maternal education and other variables –- strongly suggesting that they cannot be due to poor education since this has not yet begun to exert an effect."

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Paolo Shirasi

@PaoloShirasi

8 months

With only 160 short gene sequences, race can be determined with nearly 100% accuracy for Europeans, Asians, and Africans.

Human Population Genetic Structure and Inference of Group Membership

A major goal of biomedical research is to develop the capability to provide highly personalized health care. To do so, it is necessary to understand the distribution of interindividual genetic...

www.cell.com

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Paolo Shirasi

@PaoloShirasi

6 months

Study finds male-female brain differences and is able to predict "individual IQ scores for males and females separately using whole-brain functional connectivity."

Gender Differences in Connectome-based Predictions of Individualized Intelligence Quotient and...

Abstract. Scores on intelligence tests are strongly predictive of various important life outcomes. However, the gender discrepancy on intelligence quotient

academic.oup.com

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Paolo Shirasi

@PaoloShirasi

1 year

The correlation between adopted brothers and sisters (genetically unrelated people raised together) shows that the IQ correlation between them basically falls to *zero* in adulthood — suggesting shared childhood environment has no impact on intelligence in adulthood.

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Paolo Shirasi

@PaoloShirasi

5 months

@smooth_pebbles That theory isn't taken seriously by researchers anymore, and hasn't been for quite some time.

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Paolo Shirasi

@PaoloShirasi

2 months

In a study involving 155,191 students from 41 American colleges and universities, SAT scores predicted academic performance even after socioeconomic status (SES) was controlled. SES added negligible additional predictive power.

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Paolo Shirasi

@PaoloShirasi

3 months

@whstancil You're embarrassing people on the left who think seriously about how measured differences in traits intersect with social and economic inequality. You seem to be making what is exclusively a moral argument, but it ought to be a scientific one. To do that, though, you'd have...

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Paolo Shirasi

@PaoloShirasi

2 years

Almost no one in intelligence research believes all racial groups have the same average IQ. The (overwhelmingly left-wing) American Psychological Association has explicitly stated that the black-white IQ gap is one standard deviation (a 15-point difference).

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Paolo Shirasi

@PaoloShirasi

11 months

In spite of the better schools immigrant children attend in their new countries, their measured cognitive and academic abilities "remain at the level of their origin countries not only in the first generation, but also in the second and even later on."

Why Do the Results of Immigrant Students Depend So Much on Their Count

In spite of the many criticisms to which PISA can and should be legitimately subjected, it is difficult to deny that this large and highly successful OECD project is a blessing for research in...

link.springer.com

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Paolo Shirasi

@PaoloShirasi

2 years

A VERY BASIC INTRODUCTION TO THE HEREDITARIAN POSITION ON RACE AND IQ PART 1: Introduction PART 2: What Is General Intelligence? PART 3: Quality of Intelligence Research

Paolo Shirasi

@PaoloShirasi

2 years

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Paolo Shirasi

@PaoloShirasi

7 months

"The first modern humans who were present in the New World did not contribute much ancestry to today’s Native Americans at all."

A whole New World

Archaeology and genetics keep rewriting the ancient peopling of the Americas

www.razibkhan.com

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Paolo Shirasi

@PaoloShirasi

4 months

A soon to be released meta-analysis finds that the mean undergraduate IQ has declined to 102.

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Paolo Shirasi

@PaoloShirasi

7 months

The female pelvic shape and typical childbirth pattern differs among various racial groups. Therefore, obstetrician training based on a European pelvis model should be updated, "especially in a multi-ethnic society."

Differences Found in Women's Birth Canals Are Contradicting What Evolutionary Science Told Us

Debunking the 'obstetrical dilemma'.

www.sciencealert.com

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Paolo Shirasi

@PaoloShirasi

5 months

"Natural selection... has been acting on us for the past 3,000 years, right up to the modern day, new research suggests. And it seems to be acting in surprising ways on complex traits encoded by multiple genes, such as those tied to intelligence..."

Natural selection has been acting on hundreds of human genes in the last 3,000 years

A new study suggests that human ingenuity hasn't exempted us from the forces of evolution.

www.livescience.com

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Paolo Shirasi

@PaoloShirasi

4 months

@ibramxk Dr. Kendi, this table showing group IQ distributions from a large sample set of Americans explains most of why we observe racial disparities in those positions that require a high level of cognitive ability.

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Paolo Shirasi

@PaoloShirasi

4 months

Identical twins tend to have the same IQ, even when raised apart — the correlation of adult IQ between them if raised apart is 0.75 to 0.80. The correlation between two adults of different biological parents raised in the same household is almost zero in adulthood. Thread.

Paolo Shirasi

@PaoloShirasi

2 years

Studies have found childhood IQ correlations of up to .88 for identical twins of the same sex raised in the same family. But siblings who are raised in the same family who are *not* related to each other have a correlation of only .04 by adulthood.

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Paolo Shirasi

@PaoloShirasi

4 months

Perpetration of violence rate in group with IQ between 70 and 79: 16.3%. Perpetration of violence rate in group with IQ between 120 and 129: 2.9%.

Association between intelligence quotient and violence perpetration in the English general popula...

Association between intelligence quotient and violence perpetration in the English general population - Volume 49 Issue 8

www.cambridge.org

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Paolo Shirasi

@PaoloShirasi

8 months

IQ matters more than all other family background variables combined when predicting who might become an inventor. The direct effect of IQ was almost five times as large as that of having a high-income father.

The Social Origins of Inventors

www.nber.org

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Paolo Shirasi

@PaoloShirasi

1 year

Just-published study analyzed ancient human genomes to reconstruct human out-migration from Africa and finds a period of genetic adaptation within the last 45,000 years in non-African regions affecting various biological (including neurological) systems.

The role of genetic selection and climatic factors in the dispersal of anatomically modern humans...

The evolutionarily recent dispersal of anatomically modern humans (AMH) out of Africa (OoA) and across Eurasia provides a unique opportunity to exa...

www.pnas.org

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Paolo Shirasi

@PaoloShirasi

6 months

Since this is being discussed on X today: "Ashkenazi Jews have the highest average IQ of any ethnic group for which there are reliable data. They score 0.75 to 1.0 standard deviations above the general European average, corresponding to an IQ 112 – 115."

The Atomic Bomb Considered As Hungarian High School Science Fair Project

I. A group of Manhattan Project physicists created a tongue-in-cheek mythology where superintelligent Martian scouts landed in Budapest in the late 19th century and stayed for about a generation, a…

slatestarcodex.com

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Paolo Shirasi

@PaoloShirasi

6 months

“Individuals with lower intelligence levels (typically measured as IQ) tend to be more likely to engage in criminal behavior," and there is "consistent evidence of a mostly linear" association between low IQ and criminality.

Intelligence and criminal behavior in a total birth cohort: An examination of functional form,...

Intelligence has been found to predict a wide range of criminal and antisocial behaviors, including violent and chronic offending. The results from this literature have shown that individuals with...

psycnet.apa.org

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Paolo Shirasi

@PaoloShirasi

7 months

“Race and ethnicity are now more important than either family income or parental education in accounting for [SAT] score differences.” White and Asian students from the poorest families perform at same level as black students from the wealthiest families.

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Paolo Shirasi

@PaoloShirasi

2 years

[THREAD] A VERY BASIC INTRODUCTION TO THE HEREDITARIAN POSITION ON RACE AND IQ. PART 4: Size of Race IQ Gaps

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Paolo Shirasi

@PaoloShirasi

6 months

Meta-analyses find race differences in self-esteem, with blacks scoring highest among all groups, and Asians scoring lowest. "Most of these differences were smallest in childhood and grew larger with age."

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Paolo Shirasi

@PaoloShirasi

2 months

"The number of northern Europeans with IQs greater than 140 should be 4 per thousand while 23 per thousand Ashkenazim should exceed the same threshold, a six fold difference."

Natural history of Ashkenazi intelligence - PubMed

This paper elaborates the hypothesis that the unique demography and sociology of Ashkenazim in medieval Europe selected for intelligence. Ashkenazi literacy, economic specialization, and closure to...

pubmed.ncbi.nlm.nih.gov

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Paolo Shirasi

@PaoloShirasi

4 months

Although it is scientifically established that the average IQ of black Americans is lower than that of white Americans, only about 41% of US adults are aware of the gap.

US Public Perceptions of an Intelligence Quotient Test Score Gap Between Black Americans and White...

Intelligence quotient (IQ) is a common measure of intelligence that associates with many important life outcomes. Research over several decades has indicated th...

journals.sagepub.com

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Paolo Shirasi

@PaoloShirasi

1 year

A meta-analysis of the relationship between brain volume and general intelligence found that the correlation between the two was 0.33. "For all age and sex groups, it is clear that brain volume is positively correlated with intelligence."

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Paolo Shirasi

@PaoloShirasi

1 year

(Thread) Pervasive myths about human intelligence include: — Genes are not important for determining intelligence — IQ tests only measure how good you are at taking tests — Racial IQ differences are completely environmental — IQ does not correspond to brain anatomy

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Paolo Shirasi

@PaoloShirasi

2 years

Genetic differentiation between races is greater than previously thought. "Notably, our new approach estimates larger FST values of 26% for native worldwide human populations... whereas the existing approach estimates 9.8%."

New kinship and FST estimates reveal higher levels of differentiation in the global human population

Kinship coefficients and F ST, which measure genetic relatedness and the overall population structure, respectively, have important biomedical applications. However, existing estimators are only...

www.biorxiv.org

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Paolo Shirasi

@PaoloShirasi

5 months

@SaltyGeology Direct genetic inheritance from higher-IQ parents.

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Paolo Shirasi

@PaoloShirasi

5 months

The white children (of educationally-average white birth parents) scored 6 points above the white mean, while black children (of educationally-average black birth parents) scored 4 points above the black mean.

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Paolo Shirasi

@PaoloShirasi

2 years

A variety of scientifically-designed tests measuring general intelligence (called “g”) administered to millions of people over decades report consistent IQ results in the following ranges: NE Asians, 102-108 (105 mean) US Whites, 97-103 (100 mean) US Blacks, 81-90 (85 mean)

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Paolo Shirasi

@PaoloShirasi

8 months

Abacus training of Sudanese children increased their IQ test performance by a statistically significant 7.11 points.

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Paolo Shirasi

@PaoloShirasi

6 months

In a sample of 259 extremely high IQ adolescents (from the top 0.01% of the population in intelligence), 37% had doctorates, 9% had patents, 39% had peer-reviewed publications, along with various other accomplishments.

When Lightning Strikes Twice: Profoundly Gifted, Profoundly Accomplished - Matthew C. Makel,...

The educational, occupational, and creative accomplishments of the profoundly gifted participants (IQs ⩾ 160) in the Study of Mathematically Precocious Youth (S...

journals.sagepub.com

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Paolo Shirasi

@PaoloShirasi

11 months

The average IQ of a state negatively correlates with murder, assault, burglary, and robbery, even after controlling for demographic variables. "Results suggest that the prevalence of both violent and property crimes is associated with lower state IQs."

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Paolo Shirasi

@PaoloShirasi

1 year

Sandra Scarr recounts the "scary era" of the late-60s and 70s when behavioral geneticists were physically attacked and threatened by leftwing activists for conducting scientific research because they believed that "evolution applies to human behavior." Thread.

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Paolo Shirasi

@PaoloShirasi

2 months

"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."

The genetics of violent behavior

The violence in our society has motivated biomedical researchers to look for predictive markers and study which genes and disruptions in the brain’s activity cause this destructive human behavior.

www.jax.org

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Paolo Shirasi

@PaoloShirasi

3 months

@whstancil ... to take the time to become informed on the scientific findings. But for some reason you seem determined to not do this.

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Paolo Shirasi

@PaoloShirasi

4 months

A new paper by Robert Plomin, the leading figure in behavioral genetics, repeats the counter-intuitive but widely-accepted finding that the effect of the family environment on cognitive ability drops to virtually zero by early adulthood.

Nature, nurture and nonshared environment in cognitive development

One of the most important findings from behavioural genetic research is that nature, not nurture, makes children in a family similar in personality and psychopathology. The same research provides the...

osf.io

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Paolo Shirasi

@PaoloShirasi

8 months

IQ was found to be a significant predictor of grades for both blacks and whites. Blacks and whites with similar IQ scores had roughly similar grades.

Role of mental abilities and mental tests in explaining high-school grades.

It is well-known that some students earn higher grades than others; however, published research on the mental abilities that are correlated with high school grades is sparse. Two studies examined the...

psycnet.apa.org

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Paolo Shirasi

@PaoloShirasi

8 months

"We find that sex differences in total brain volume are not accounted for by sex differences in height and weight, and that once global brain size is taken into account, there remain numerous regional sex differences in both directions."

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Paolo Shirasi

@PaoloShirasi

1 year

Groups were asked to perform a series of cognitively-demanding tasks, and were scored for their performance on each one. Average individual IQ was by far the strongest predictor of group performance, accounting for around 80% of the variance.

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Paolo Shirasi

@PaoloShirasi

3 months

@whstancil I'd recommend that you start with Kathryn Paige Harden's The Genetic Lottery: Why DNA Matters for Social Equality. She's a progressive. Freddie deBoer, a Marxist, has also written intelligently about the subject.

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Paolo Shirasi

@PaoloShirasi

1 year

A good general source:

Meta-analysis of the heritability of human traits based on fifty years of twin studies

Nature Genetics - Danielle Posthuma, Peter Visscher and colleagues report a meta-analysis of 17,804 traits based on virtually all twin studies from the last 50 years. For a majority of traits, twin...

www.nature.com

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Paolo Shirasi

@PaoloShirasi

5 months

@markessien How do you explain how Indian-Americans outperform European Americans in the US? Perhaps selective immigration has something to do with it? Or specific characteristics of the populations taking the test?

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Paolo Shirasi

@PaoloShirasi

2 years

James Lee, a leading behavioral geneticist, writes that "a policy of deliberate ignorance has corrupted top scientific institutions... prestigious journals will often reject submissions that involve... controversial aspects of human biology and behavior."

Don’t Even Go There

The agency now restricts access to an important database if it thinks a scientist’s research may enter “forbidden” territory.

www.city-journal.org

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Paolo Shirasi

@PaoloShirasi

4 months

In 2020, the University of California's Standardized Testing Task Force found that both SAT scores and high school GPA predict college GPA (and other measures of success in college). The task force found no evidence of racial test bias.

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Paolo Shirasi

@PaoloShirasi

6 months

The first-ever meta-analysis (involving over 160,000 individuals) of the associations of personality and intelligence found that openness and neuroticism had the strongest associations with higher IQ among the Big 5 personality traits.

Personality and Intelligence: A Meta-Analysis

This study provides a comprehensive assessment of the associations of personality and intelligence. It presents a meta-analysis (N = 162,636, k = 272) of domain, facet, and item-level correlations...

osf.io

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Paolo Shirasi

@PaoloShirasi

5 months

New study finds a math/science ability tilt for East Asia and a verbal ability tilt for Europe and America. Math ability tilt "predicted higher economic growth."

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Paolo Shirasi

@PaoloShirasi

1 year

The Journal of Individual Differences, which publishes research on differences in human intelligence and personality, has the highest replicability rate (an extraordinary 97%) in all of psychology.

2022 Replicability Rankings of Psychology Journals

A major replication project of 100 studies published in 2008 showed that only 37% of published significant results could be replicated (i.e., the replication study also produced a significant resul…

replicationindex.com

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Paolo Shirasi

@PaoloShirasi

5 months

Genome study finds that natural selection in humans has been ongoing over the last 6,000 years, including with respect to cognitive functions, and that these changes could have been shaped by cultural practices.

Changes in Biological Pathways During 6,000 Years of Civilization in Europe

Abstract. The beginning of civilization was a turning point in human evolution. With increasing separation from the natural environment, mankind stimulated

academic.oup.com

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Paolo Shirasi

@PaoloShirasi

2 months

"Research has consistently found lower cognitive ability to be related to increased risk for violent and other antisocial behavior." Since the association remains after adjusting for parental SES and other variables, it is often assumed to be causal.

Is the Association between General Cognitive Ability and Violent Crime Caused by Family-Level...

Background Research has consistently found lower cognitive ability to be related to increased risk for violent and other antisocial behaviour. Since this association has remained when adjusting for...

journals.plos.org

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Paolo Shirasi

@PaoloShirasi

11 months

James Flynn: "Everyone knows if we only allowed short people to reproduce there would be a tendency in terms of genes for height to diminish. Intelligence is no different from other human traits."

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Paolo Shirasi

@PaoloShirasi

1 month

Self-control is about 60% heritable, according to this meta-analysis of 31 studies.

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Paolo Shirasi

@PaoloShirasi

4 months

Large-sample study involving almost a million students finds that sex differences are universal across dozens of countries and cultures — sex can be predicted by academic interests and abilities.

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Paolo Shirasi

@PaoloShirasi

2 months

"Stanford Medicine researchers have developed a powerful new artificial intelligence model that can distinguish between male and female brains."

Stanford Medicine study identifies distinct brain organization patterns in women and men

Stanford Medicine researchers have developed a powerful new artificial intelligence model that can distinguish between male and female brains.

med.stanford.edu

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Paolo Shirasi

@PaoloShirasi

2 months

"We report strong evidence of familial clustering of sexual offending, primarily accounted for by genes rather than shared environmental influences."

Sexual offending runs in families: A 37-year nationwide study

Abstract. Background: Sexual crime is an important public health concern. The possible causes of sexual aggression, however, remain uncertain.Methods: We e

academic.oup.com

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Paolo Shirasi

@PaoloShirasi

2 years

Latest research finding sex brain differences: Large study of nearly 10,000 boys and girls was able to detect the sex of an individual by examining the patterns of grey and white matter in the brains.

The sexual brain, genes, and cognition: A machine-predicted brain sex score explains individual...

Sex impacts the development of the brain and cognition differently across individuals. However, the literature on brain sex dimorphism in humans is mixed. We aim to investigate the biological...

pubmed.ncbi.nlm.nih.gov

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Paolo Shirasi

@PaoloShirasi

2 years

Based on a sample of 1.1 million students, the study finds that of all possible factors affecting SAT performance, race has become "the strongest predictor."

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Paolo Shirasi

@PaoloShirasi

4 months

Cognitive ability at age 13 had "substantially more explanatory power" than socioeconomic status measures (e.g., class, parental income and education) with regard to academic and other life outcomes.

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Paolo Shirasi

@PaoloShirasi

2 years

" We found no support for any downside to higher [cognitive] ability and no evidence for a threshold beyond which greater [IQ] scores cease to be beneficial. Thus, greater cognitive ability is generally advantageous-and virtually never detrimental."

Can You Ever Be Too Smart for Your Own Good? Comparing Linear and Nonlinear Effects of Cognitive...

Despite a long-standing expert consensus about the importance of cognitive ability for life outcomes, contrary views continue to proliferate in scholarly and popular literature. This divergence of...

pubmed.ncbi.nlm.nih.gov

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Paolo Shirasi

@PaoloShirasi

5 months

This study of the black-white IQ gap estimates that the portion of that gap explained by genetic differences between the groups is about 60%, which is roughly consistent with the results of an experts survey published in the journal Intelligence in 2020.

Global Ancestry and Cognitive Ability

Using data from the Philadelphia Neurodevelopmental Cohort, we examined whether European ancestry predicted cognitive ability over and above both parental socioeconomic status (SES) and measures of...

www.mdpi.com

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Paolo Shirasi

@PaoloShirasi

2 years

Self-control in childhood predicts later intelligence, employment, education, criminal behavior, mental health, substance use in a meta-analysis of 150 studies and over 215,000 individuals. Self-control is about 60% heritable.

Self-regulation in childhood as a predictor of future outcomes: A meta-analytic review - PubMed

This meta-analysis explores whether self-regulation in childhood relates to concurrent and subsequent levels of achievement, interpersonal behaviors, mental health, and healthy living. A comprehens...

pubmed.ncbi.nlm.nih.gov

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Paolo Shirasi

@PaoloShirasi

8 months

Genetic analysis (GWAS) of antisocial behavior found it negatively correlates with intelligence (rg -0.40) and educational attainment (rg -0.46). The association between lower IQ and higher antisocial behavior is a consistent finding.

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Paolo Shirasi

@PaoloShirasi

6 months

Genomic analysis finds that the skin color of the inhabitants of west Eurasia was almost entirely "dark" to "black" around 12,000 years ago.

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Paolo Shirasi

@PaoloShirasi

4 months

Meta-analysis of 39 randomized controlled trials confirms that early childhood interventions temporarily raise intelligence, but that effect fades away (the "fade-out effect").

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Paolo Shirasi

@PaoloShirasi

2 years

Blacks in the US report higher self-esteem than whites, not the lower self-esteem posited by stereotype threat. "Most of these differences were smallest in childhood and grew larger with age. Blacks' self-esteem increased over time relative to Whites.'"

Race and self-esteem: meta-analyses comparing whites, blacks, Hispanics, Asians, and American...

These meta-analyses examine race differences in self-esteem among 712 datapoints. Blacks scored higher than Whites on self-esteem measures (d = 0.19), but Whites scored higher than other racial...

pubmed.ncbi.nlm.nih.gov

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Paolo Shirasi

@PaoloShirasi

1 year

"We have conducted a meta-analysis of virtually all twin studies published in the past 50 years... on more than 14 million twin pairs... Our results provide compelling evidence that all human traits are heritable."

Meta-analysis of the heritability of human traits based on fifty years of twin studies

Nature Genetics - Danielle Posthuma, Peter Visscher and colleagues report a meta-analysis of 17,804 traits based on virtually all twin studies from the last 50 years. For a majority of traits, twin...

www.nature.com

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Paolo Shirasi

@PaoloShirasi

2 years

The IQ of children adopted at birth has no correlation with the IQ of their adoptive parents, but is strongly correlated with IQ of their biological parents. This association becomes stronger as children grow older.

Nature, nurture, and cognitive development from 1 to 16 years: A parent–offspring adoption study.

Conducted a 20-yr longitudinal adoption study of 245 adopted children and their biological and adoptive parents, as well as 245 matched nonadoptive (control) parents and offspring to examine genetic...

psycnet.apa.org

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Paolo Shirasi

@PaoloShirasi

2 years

A 2001 meta-analysis involving IQ data for over 6 million individuals found a 15-point gap between blacks and whites. (How many meta-analyses involving millions of individuals are there in areas within psychology not having to do with IQ? Answer: None to hardly any.)

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Paolo Shirasi

@PaoloShirasi

2 years

The 15-point black-white gap in IQ is accepted in most of the scientific literature, although some scientists, most notably James Flynn, have argued that it's actually closer to a ten-point difference.

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Paolo Shirasi

@PaoloShirasi

2 years

The cognitive disadvantage of blacks becomes most extreme at the far-right tails of the IQ statistical distribution curves, where the very brightest are. For example, 0.47% of NE Asians (about 1 in 200) have an IQ of 145, but only 0.0012% of US blacks (about 1 in 85,000) do.

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Paolo Shirasi

@PaoloShirasi

2 years

"Social construct? Forget it. Race is biologically real.” — Richard Dawkins, The Ancestors Tale, 2015. “Every geneticist knows that the 'Race doesn’t exist' dogma is a convenient PC 1/4-truth.” — Steven Pinker, Twitter, 2013.

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Paolo Shirasi

@PaoloShirasi

2 months

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.

Genome-wide association study of school grades identifies genetic overlap between language ability,...

Scientific Reports - Genome-wide association study of school grades identifies genetic overlap between language ability, psychopathology and creativity

www.nature.com

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Paolo Shirasi

@PaoloShirasi

2 months

"The unique demography and sociology of Ashkenazim in medieval Europe selected for intelligence. Ashkenazi literacy, economic specialization, and closure to inward gene flow led to a social environment in which there was fitness payoff to intelligence."

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Paolo Shirasi

@PaoloShirasi

1 year

Researchers in India have created the first-ever Indian Brain Atlas. "The study has revealed that the Indian brain, on average, is smaller in height, width, and volume when compared to Western and other eastern populations."

Indians have smaller brains, reveals study | India News - Times of India

India News: International Institute of Information Technology, Hyderabad (IIIT-H) has created the first-ever Indian Brain Atlas. While there are templates for Cau

timesofindia.indiatimes.com

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Paolo Shirasi

@PaoloShirasi

1 year

Huge meta-analysis (involving 14,558,903 twin pairs) provided the most comprehensive estimate yet of the causes of individual differences in 17,804 human traits: A heritability of 49% is reported across all traits.

Meta-analysis of the heritability of human traits based on fifty years of twin studies

Nature Genetics - Danielle Posthuma, Peter Visscher and colleagues report a meta-analysis of 17,804 traits based on virtually all twin studies from the last 50 years. For a majority of traits, twin...

www.nature.com

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Paolo Shirasi

@PaoloShirasi

1 year

Non-replicable scientific studies tend to be cited more often than replicable studies. "This difference in citation does not change after the publication of the failure to replicate."

Nonreplicable publications are cited more than replicable ones - PubMed

We use publicly available data to show that published papers in top psychology, economics, and general interest journals that fail to replicate are cited more than those that replicate. This differ...

pubmed.ncbi.nlm.nih.gov

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Paolo Shirasi

@PaoloShirasi

2 years

A massive meta-analysis involving 14,558,903 twin pairs (virtually all published twin studies of complex traits) found that twin resemblance on complex traits (including psychological traits) is "solely due to additive genetic variation."

Meta-analysis of the heritability of human traits based on fifty years of twin studies

Nature Genetics - Danielle Posthuma, Peter Visscher and colleagues report a meta-analysis of 17,804 traits based on virtually all twin studies from the last 50 years. For a majority of traits, twin...

www.nature.com

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Paolo Shirasi

@PaoloShirasi

4 months

Study finds that the impact of a parent's education on their children's educational attainment is negligible once genetics is accounted for. In other words, educational attainment is almost wholly explained by genetic transmission.

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Paolo Shirasi

@PaoloShirasi

9 days

"People are remarkably accurate (approaching ceiling) at deciding whether faces are male or female, even when cues from hairstyle, makeup, and facial hair are minimized."

Sex discrimination: how do we tell the difference between male and female faces? - PubMed

People are remarkably accurate (approaching ceiling) at deciding whether faces are male or female, even when cues from hair style, makeup, and facial hair are minimised. Experiments designed to...

pubmed.ncbi.nlm.nih.gov

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Paolo Shirasi

@PaoloShirasi

1 year

Predicting IQ from brain imaging: A new machine learning-based predictive modeling framework for neuroscience may make it possible to predict IQ scores from as few as 20 time frames fMRI data.

How much data do we need? Lower bounds of brain activation states to predict human cognitive ability

Human functional brain connectivity can be temporally decomposed into states of high and low cofluctuation, defined as coactivation of brain regions over time. Despite their low frequency of occurr...

www.biorxiv.org

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Paolo Shirasi

@PaoloShirasi

5 months

Large study of 70,000 children found correlation of IQ at age 11 and educational achievement at age 16 to be 0.81.

(PDF) Intelligence and Educational Achievement

PDF | This 5-year prospective longitudinal study of 70,000 + English children examined the association between psychometric intelligence at age 11 years... | Find, read and cite all the research you...

www.researchgate.net

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Paolo Shirasi

@PaoloShirasi

2 years

1/ The quality of published scientific research into human intelligence is arguably higher than in any other area of psychology.

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Paolo Shirasi

@PaoloShirasi

7 months

Study analyzes 15 years of data on Finnish twins and finds that "54% of the variance of men’s lifetime income is due to genetic factors and that the contribution of the shared environment is negligible."

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Paolo Shirasi

@PaoloShirasi

5 months

Among brothers within the same family, the one with lower IQ ability is more likely to be convicted of a violent crime. The persistence of the effect suggests something other than socioeconomic factors — probably genetics — is in play.

Is the Association between General Cognitive Ability and Violent Crime Caused by Family-Level...

Background Research has consistently found lower cognitive ability to be related to increased risk for violent and other antisocial behaviour. Since this association has remained when adjusting for...

journals.plos.org

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Paolo Shirasi

@PaoloShirasi

1 year

"Study identified the genetic ancestry (European or African) of a skeleton with up to 92% accuracy using a variety of machine learning classification models."

Ancestry Estimation Using Cranial and Postcranial Macromorphoscopic Traits

Ancestry estimation methods using macromorphoscopic (MMS) traits commonly focus exclusively on cranial morphology. The objective of this study was to demonstrate the value of postcranial MMS traits,...

onlinelibrary.wiley.com

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Paolo Shirasi

@PaoloShirasi

2 years

[THREAD] A VERY BASIC INTRODUCTION TO THE HEREDITARIAN POSITION ON RACE AND IQ. PART 18: Rebutting the Environmentalist Claim That 'Race Is Purely a Social Construct'

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Paolo Shirasi

@PaoloShirasi

2 years

[THREAD] A VERY BASIC INTRODUCTION TO THE HEREDITARIAN POSITION ON RACE AND IQ. PART 21: Rebutting Claims That IQ Tests Don't Measure Intelligence (Or Anything Valuable)

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