Mehta, C. M., Malins, J. G., Noble, K. G., & Gruen, J. R. (2017). Cortical area and subcortical volume mediate the effect of parental education and adverse experiences on cognitive performance in youth. bioRxiv, 160424. Remember “poverty shrinks the brain from birth”? From birth! Fast acting that poverty, actually before birth too. Anyway, Kimberly Noble […]

Warne, R. T. (2018). An Evaluation (and Vindication?) of Lewis Terman: What the Father of Gifted Education Can Teach the 21st Century. Gifted Child Quarterly, 0016986218799433. Russell Warne has a new piece out reviewing the life and criticism of Lewis Terman. While Warne generally defends Terman against criticism, he thinks that Terman went beyond his […]

I wish to coin a fallacy I’ve seen a number of times, exemplified in this paper: Kempthorne, O. (1978). A BIOMETRICS INVITED PAPER: Logical, epistemological and statistical aspects of nature-nurture data interpretation. Biometrics, 1-23. Abstract: In this paper the nature of the reasoning processes applied to the nature-nurture question is discussed in general and with […]

Most readers are probably aware of the fraud accusations against Cyril Burt on account of various claims, but in particular the repeated digits across populations and other numerical irregularities. There’s also the case of the supposed missing research assistants/coauthors. I came across a particularly illuminating account, worth sharing here: Jensen, A. R. (1992). “Scientific fraud […]

In 2016, a Brazilian PHD student with access to the Brazilian Pelotas dataset was kind enough to run a few regressions for us. We apparently forgot to make the results public, but do so now so others can see. I have also previously analyzed some of this data which was later published in an obscure […]

Since this topic comes up repeatedly and I have to find the same studies over and over, here’s a little review. Vertical cultural transfer (various other names: vertical cultural inheritance, cultural transmission) is the main effect proposed by various social scientists for the similarity of parents and kids. It differs from the shared environment concept. […]

Wilson, R. S. (1976). Concordance in physical growth for monozygotic and dizygotic twins. Annals of Human Biology, 3(1), 1-10. Heights and weights were analysed for 636 twins who had been repeatedly measured from birth to 4 years. MZ twins were less concordant for birth weight than DZ twins, principally as a result of a few […]

Few people actually read this, which is a shame because the science is interesting for historical purposes, and the fulltext of his famous fallacy is rarely read. I believe this is a pity because it is really obvious when you actually read it. Lewontin, R. C. (1972). “The Apportionment of Human Diversity”. Evolutionary Biology. pp. […]

Antonio Regalado is providing us with a recent series of the arguably best informed (compared to Guardian, Nature news etc.) popular science articles on genomics and its relevance to modern eugenics (embryo selection or genetic engineering) as well as the group differences causation question. As background for some of these, I had […]

It has been noted that East Asians are positive outliers for the latitude ~ IQ pattern, they’re too far south for their high IQs. Some possible reasons for this are: The peoples evolved further north and migrated south in recent times, and their intelligence level is related to their recent origin, not current location, just […]