Rorschach tests predict stuff
Rorschach tests are those inkblot things you sometimes see in movies. They are generally considered bad, in line with Myers-Briggs of bad early 1900s ideas in psychology. Here's Wikipedia: Some…
Book review: A Short History of Humanity: A New History of Old Europe by Johannes Krause
I read this book the other day and it's worth reviewing in some detail. Krause, J., & Trappe, T. (2022). A short history of humanity: A new history of old…
IQ estimates of public intellectuals and personas
Given the interest in the recent estimates of Scott Alexander's, Gwern's etc. IQs on Twitter, I thought it might be informative and entertaining to carry out a real survey (defined…
Modern neuroscience confirms race differences in brain size and functioning
There has been frequent criticism of Phil Rushton's role as synthesizer of research on race differences. Ed Dutton's deep dive into Rushton's own claims about his life revealed some inconsistencies…
Group differences are just individual differences, really
Noah Carl has a new post on treating the ethics of individual differences the same as ethics of group differences: Which prompts the question: if genes contributing to group differences…
New study didn’t really show IQ declines*
Dworak, E. M., Revelle, W., & Condon, D. M. (2023). Looking for Flynn effects in a recent online US adult sample: Examining shifts within the SAPA Project. Intelligence, 98, 101734.…
New paper: On group differences in the heritability of intelligence: A reply to Giangrande and Turkheimer (2022)
So it was finally published, our reply to our frenemies Eric Turkheimer and his student Evan J. Giangrande. For good measure, it's these two guys: The saga begins in 2020:…
Does tutoring work? It depends on the test
A reader sends me this question: Hi Emil, I'm wondering what your opinion is on the question of whether reading comprehension skills can be improved through tutoring. I'm an American…
Brief introduction to test bias in mental testing
Although Meng Hu has recently provided a very thorough review of test bias methods, I thought it would be helpful to have a more visual, intuitive approach for those not…
Obesity and the secular decline in testosterone
One thing I didn't address in the last post about the decline of everything manly is that obesity is a potential cause of secular declines in testosterone. That's because the…
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