@iointelresearch

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
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i/o research retweeted
i/o
@avidseriesOct 16
Here's a graphic that charts the migratory/genetic history of contemporary Europeans starting about one million years ago, according to the theory being advanced in David Reich's new preprint.
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New David Reich preprint proposes the expansion of early modern humans into Europe 300,000 years ago, likely originating from the Near East and/or Northeast Africa — long before the migrations about 50,000 years ago posited by the Out of Africa theory. biorxiv.org/content/10.64898…
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New brain imaging study: "We observe that sex differences [in subcortical gray matter] emerge over adolescence, with males showing higher restricted diffusion and lower hindered diffusion than females across all deep gray structures interrogated." sciencedirect.com/science/ar…
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Commentary: "Differences between males and females in the fine-grained tissue structure of deep brain regions are minimal at ages 9 to 12 but emerge and widen during adolescence." psypost.org/puberty-may-mark…

Puberty may mark a turning point for sex differences in the brain’s emotion and memory centers

Brain scans of more than 1,600 young people suggest that the fine-grained tissue structure of the amygdala, hippocampus, and other deep brain regions is similar in boys and girls at ages 9 to 12, but...

psypost.org
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"The timing coincides with puberty and with the period when sex differences in conditions like anxiety and depression begin to appear... differences began to emerge between ages 13 and 16, first in the hippocampus, amygdala, and thalamus."
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New study using UK Biobank database of 455,000 individuals finds that a larger number of genetic links to human intelligence can be identified by using statistical models to fill in missing test scores (not everyone in the database took a cognitive test). nature.com/articles/s41588-0…

Imputation of fluid intelligence scores reduces ascertainment bias and increases power for analyses...

Nature Genetics - Imputing unmeasured fluid intelligence scores in UK Biobank reduces ascertainment bias and increases power for genetic analyses, improving out-of-sample polygenic score...

nature.com
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Although over half of those 26 genes are already known to cause severe intellectual disabilities, this study revealed that milder mutations in these genes can slightly lower everyday intelligence, even in people who do not have a diagnosed medical condition.
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The study shows that rare genetic mutations affect everyday intelligence more than previously understood, and that statistically filling in missing data is a powerful way to uncover the biology of human cognition without requiring millions of people to take hours of tests.
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"90% of the genetic variants influencing the Big Five personality traits also impact intelligence... intelligence was as similar to the Big Five traits as they were to one another. Genetically... intelligence fits in with the rest of personality." biorxiv.org/content/10.64898…

Intelligence and the Big Five personality traits share a genetic and biological basis

Intelligence is often considered to be fundamentally different from other personality traits. Twin studies show that intelligence and the Big Five personality traits are partly influenced by the same...

biorxiv.org
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Updated findings from large meta-analysis on the association between IQ and job performance: "Across multiple analyses, the mean operational validity of general mental ability for overall job performance falls in the .18–.22 range." link.springer.com/article/10…

Is general mental ability still the best predictor of job performance? Integrating contemporary...

Journal of Business and Psychology - For decades, general mental ability (GMA) has been described as the single best predictor of job performance, with meta-analyses suggesting corrected validities...

link.springer.com
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"For decades, [IQ] has been described as the single best predictor of job performance, with meta-analyses suggesting corrected validities near .50. This conclusion has been recently challenged on two fronts [i.e., methodologically and with more recent data]."
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[THREAD] 1/ Massive new study involving over 1 million individuals: "We find that the genetic architecture of personality is robustly generalizable, minimally confounded and widely relevant to human experience." 1,260 genetic variants are identified. nature.com/articles/s41586-0…

Robust inference and correlates from genetic associations with personality

Nature - The genetic architecture of personality is robustly generalizable, minimally confounded and widely relevant to human experience.

nature.com
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6/ "This result contrasts starkly with the notable within-family attenuation found for other behavioural traits, such as educational attainment (mean within/population predictive ratio of around 60%... cognitive ability [around 80%])..."
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More here: nature.com/articles/d41586-0…

Anxious or outgoing? Huge study links ‘Big Five’ personality traits to genetic variants

Nature - Researchers identify more than 1,200 personality-linked genetic variants, with effects largely independent of family background.

nature.com
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Long-term follow-up on an educational intervention in Chicago designed to improve the executive function, emotional regulation, and behavior of low-income children "found little evidence that the program had lasting impacts." psycnet.apa.org/doiLanding?d…
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"Nearly all models produced null effects across the broad array of outcomes considered. We also observed few indications that effects were moderated by posttreatment high school quality or later assignment to a light-touch mindset intervention."
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