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MH’s book review of Deafness, Deprivation, and IQ (Braden 1994)
Jeffery P. Braden. (1994). Deafness, deprivation, and IQ. Springer. See also. The study of deaf people since Braden (1994). Human Varieties. The book is a compilation of studies on deaf people, which...
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The Bell Curve, 20 years after
Or nearly so. I was planning to publish that blog article for the 31th December 2014. As you can see, I failed in this task, and didn’t finish in the right time. Anyway, I wrote this article, mainly...
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Socioeconomic Status and Heritability of IQ Redux
There’s a long-standing debate about if and how parental socioeconomic status moderates the heritability of IQ. Research has often but not always found that heritability is lower in low-SES families....
View ArticleHeritability of Racial and Ethnic Pride, Preference, and Prejudice
A while back, in “People in the Future Will Not Look Like Brazilians”, Razib suggested that the great amalgamation will stall because those who are inclined to out mix will do so, taking with them...
View ArticleThe Evolutionary Default Hypothesis and Negative HBD
Jayman (2016) argues: There is no reason to suspect that human groups that have been separated for tens of thousands of years in vastly different environments would be the same in all their cognitive...
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Equal Environments Assumption and Sex Differences
In the classic twin study design, identical (MZ) twin pairs are compared to fraternal (DZ) twin pairs so as to estimate the relative contributions of heredity and environment to individual differences....
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Measurement Error, Regression to the Mean, and Group Differences
Regression to the mean, RTM for short, is a statistical phenomenon which occurs when a variable that is in some sense unreliable or unstable is measured on two different occasions. Another way to put...
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The Persistence of Cognitive Inequality: Reflections on Arthur Jensen’s “Not...
In 1969, Harvard Educational Review published a long, 122-page article under the title “How Much Can We Boost IQ and Scholastic Achievement?” It was authored by Arthur R. Jensen (1923–2012), a...
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Classical Twin Data and the ACDE Model
Classical twin data comprise of phenotypic measurements on monozygotic (MZ) and dizygotic (DZ) twin pairs who were raised together. To derive estimates of behavioral genetic parameters (e.g.,...
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How Autism Drives Human Invention: But Is It Just Autism?
In The Pattern Seekers: How Autism Drives Human Invention (2020), Baron-Cohen proposes the Systemizing Mechanism as an explanation for human progress through invention, from the first tools to the...
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