i/o research
@iointelresearch
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A repository of scientific findings and data on human intelligence and other psychological traits. New information is added on an irregular basis.
Joined October 2021
Some threads and notable studies I've tweeted are nested under this pinned tweet.
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"Where large discrepancies occur between observed and predicted test results, the potential for improvement appears substantial. Cultural and evolutionary background factors proved to be stronger predictor... whereas genetic distance to South or East Africa was less predictive."
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"Using education, GDP per capita, and political indicators to predict test scores yields somewhat higher values for the Global South (by about 5 IQ points), with the strongest effects observed in Latin America (rising from 78 to 86 IQ points)."
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Just published: "We cross-validate the reported [IQ values of developing nations] by comparing different data sources and applying statistical predictions. Across test paradigms, the results for groups of countries appear consistent." https://t.co/tIOnlR16H2
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New paper looks at all previously-studied monozygotic twins reared apart and finds that twins with similar educations differed in IQ by about 6 points, while those with significantly different educations differed by about 15 points. https://t.co/MBH4tgN5Tn
sciencedirect.com
Over the last century, several large studies have been published exploring IQ differences amongst monozygotic (MZ) twins reared apart (TRA). By and la…
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"This study shows that sexual orientation is reflected in brain structure characteristics and that these differ between the sexes." https://t.co/TVb2nx7MJw
nature.com
Scientific Reports - Brain structure changes associated with sexual orientation
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"Regions in the precentral gyrus, precuneus and the prefrontal cortex were significantly informative for distinguishing heterosexual from homosexual participants."
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"We demonstrate for the first time that sexual orientation is reflected in specific patterns of RSFC, which enable personalized, brain-based predictions of this highly complex human trait."
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A machine learning approach using resting-state functional connectivity had an average accuracy of 92% in predicting sexual orientation. https://t.co/qFcECgg8RM
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5-year study of 70,000 English children found that the correlation between IQ at age 11 and educational achievement in 25 academic subjects at age 16 was 0.81. https://t.co/pVT7VK9D3l
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Robert Plomin: "Average differences between cultures are not necessarily 'cultural' — they might be due to genetic differences between cultures.” https://t.co/wGntRlKoOS
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"Here the Human Pangenome Reference Consortium presents a first draft of the human pangenome reference... We assembled 47 fully phased diploid assemblies from genomes selected to represent global genetic diversity." https://t.co/sjOgZGbxTS
nature.com
Nature - An initial draft of the human pangenome is presented and made publicly available by the Human Pangenome Reference Consortium; the draft contains 94 de novo haplotype assemblies from 47...
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Summary here. https://t.co/Bvv3pp8lb7
IQ matters, but it is not the only cognitive ability that matters. One of the most important is quantitative ability and a new article explores its genetic origins and impacts. The authors (including @eawilloughby) conducted a GWAS to identify genetic variants that are
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"We identified 53 [SNPs] associated with a latent trait... approximating the group factor of quantitative ability... [and we found] positive associations with STEM occupations." https://t.co/4lm6ftBDxZ
nature.com
Molecular Psychiatry - A genetic common factor underlying self-reported math ability and highest math class taken
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"We could not analyse EA and cognitive traits because of ethics restrictions. However, we emphasise that additional research using the within-family is needed to inform ongoing debates about the relative importance of direct and indirect genetic effects for such traits."
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New preprint: "We analyse approximately 500,000 sibling pairs with diverse ancestries... [we find] substantial genetic variation underlies complex traits... [and that estimates are] larger than has been accounted for by GWAS to date." https://t.co/yapwhCyXWa
medrxiv.org
Quantification of the direct effect of genetic variation on human behavioural traits is important for understanding between-individual variation in socio-economic and health outcomes but estimates of...
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"Increasingly sophisticated analysis of genetic material made possible by technological advances shows that virtually everyone came from somewhere else, and everyone’s genetic background shows a mix from different waves of migration that washed over the globe."
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Research conducted in 2015 "showed just a dozen places in the genome that had changed over the last 8,000 years in a way that might indicate natural selection." But new research conducted by Reich "found almost 500 significant changes."
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"[Harvard geneticist David] Reich said it had been believed that natural selection was minimal among humans for the last 10,000 years... [but] Reich now believes Europe, at least, is in a period of accelerated selection that began 5,000 years ago." https://t.co/VY5hzG8ung
news.harvard.edu
Geneticist explains recent analyses made possible by tech advances show human history to be one of mixing, movement, displacement.
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Meta-analysis: "We conclude that apparent effects of growth mindset interventions on academic achievement are likely attributable to inadequate study design, reporting flaws, and bias." https://t.co/Afd7qAQYaL
psycnet.apa.org
According to mindset theory, students who believe their personal characteristics can change—that is, those who hold a growth mindset—will achieve more than students who believe their characteristics...
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A new Norwegian study finds that diagnoses for all psychological disorders except bipolar disorder and affective psychosis are most common in the lowest-IQ range and least common in the highest-IQ range. https://t.co/54oviUyvto
journals.sagepub.com
The positive relation between mental health and educational attainment is well established, yet the extent to which cognitive abilities influence this gradient ...
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