New paper out: Intelligence and General Psychopathology in the Vietnam Experience Study: A Closer Look

Kirkegaard, E. O. W., & Nyborg, H. (2021). Intelligence and General Psychopathology in the Vietnam Experience Study: A Closer Look. Mankind Quarterly, 61(4). https://doi.org/10.46469/mq.2021.61.4.2 Prior research has indicated that one can summarize the variation in psychopathology measures in a single dimension, labeled P by analogy with the g factor of intelligence. Research shows that this…

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New paper out: County-level USA: No Robust Relationship between Geoclimatic Variables and Cognitive Ability

This one came out in Februrary, so we are a bit behind, but that’s because I wanted to time the blogpost with the video. Aaaand the video is online now. Pesta, B. J., Fuerst, J. G. R., & Kirkegaard, E. (2021). County-level USA: No Robust Relationship between Geoclimatic Variables and Cognitive Ability. Journal of Geographical…

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East Asian ability tilt and ideographic written language

Have you ever looked into the hypothesis of genetic differences underlying language types? such as pic.twitter.com/RWktYdllwK — Whyvert (@whyvert) May 12, 2021 I have not, but Lynn has noted that East Asians have a relative advantage in visual-spatial ability, and that’s their written language, possibly some gene-culture co-evolution. One study shows East Asians who speak…

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Book review: Kevin Mitchell’s Innate: How the Wiring of Our Brains Shapes Who We Are (2018)

This is a pretty good book. It covers a lot of basics, and gets almost everything right. Twins, adoptees, genomics are given ample attention. Mitchell is very interesting in developmental randomness, so this point gets a lot of coverage. Good! Not many people accept this. The book is fine on sex differences too, and even…

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New paper out: Country of Origin IQ and Muslim Percentage Predict Grade Point Average in School among 116 Immigrant Groups in Denmark

Kirkegaard, E. O. W., & Fedorov, J. (2021). Country of Origin IQ and Muslim Percentage Predict Grade Point Average in School among 116 Immigrant Groups in Denmark. Mankind Quarterly, 61(3). Immigrants to Western countries typically have worse social outcomes than natives, but country of origin immigrant groups differ widely. We studied school performance in Denmark…

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