Thomas Bouchard just published a response to my 2022 critical evaluation of his 1990 Minnesota #IQ twin study. Here are the full-text links for my 2022 article and Bouchard's 2023 response. I will respond at a later point.

karger.com/hde/article/66…

cambridge.org/core/journals/… In response to my charge that the Mx software used in his MISTRA twin study was designed to produce genetic results, Bouchard argued that Mx "is not MISTRA software." That's like being on trial for stealing a BMW and seeking acquittal on the grounds that it was actually a Lexus.

🧵1. (of 20). In a previous thread, I examined the “IQ heritability” evidence cited by R. Herrnstein and C. Murray in “The Bell Curve” (1994). I showed that these authors presented no valid evidence in favor of above-zero WITHIN-group IQ heritability.

https://twitter.com/jayjoseph22/status/1639658522211409920?s=20

2. I now address The Bell Curve’s most disputed claim, that some portion of the mean IQ score gap BETWEEN groups, in this case the gap between U.S. whites (European Americans) and blacks (African Americans), is caused by genetic factors.

1. 🧵Thread looking at evidence in favor of “IQ heritability” cited in “The Bell Curve: Intelligence and Class Structure in American Life” (Kindle Ed.) by Richard Herrnstein and Charles Murray. In this much-discussed 1994 book, the authors argued that… 2. ...cognitive ability (IQ) was “substantially heritable,” and that heredity explains some portion of between-group racial (Black-White) IQ score differences. Here I focus only on the flawed evidence Herrnstein & Murray cited in favor of WITHIN-group IQ heritability.

1/ Chopping a sentence to cover for a Nazi-era German psychiatric geneticist. Top genetic researcher Kenneth Kendler omitted the end of a sentence in S. Weiss' 2010 "The Nazi Symbiosis," describing Bruno Schulz's "usefulness" to Nazi SS-Ahnenerbe.
doi.org/10.1093/schbul… 2/Kendler then cited Schulz's and E. Rüdin's accomplice Erik Strömgren's whitewash of Schulz. Involved in psychiatric genetic racial hygiene in the 1930s, Strömgren is also known as the "architect" of Denmark's 10,000-strong "psychiatric brain collection."
cnn.com/2022/11/11/wor…

1/ No valid evidence for WITHIN-group "IQ heritability" in Cofnas' article. Twin and adoption studies supply evidence for heritability based on "certain testable assumptions." Twin and adoption study assumptions have been "tested" and shown to be false!

https://twitter.com/nathancofnas/status/1586096174489968641?s=20&t=OhxPz-T5y3Hj1vMextv28Q

2/ IQ GWAS "associations" are likely spurious, and do not identify causative genes. In the abstract of his 2020 article Cofnas said, "In a very short time, it is likely that we will identify many of the genetic variants underlying individual differences in intelligence"...

1/ Thoughts and comments about an interview with K. Paige Harden in the 9/12/2021 ed. of The Guardian. The interviewer is Zoë Corbyn. Harden is promoting her behavioral genetics (BG) field, and her book "The Genetic Lottery." UOS, all quotes from Harden.

theguardian.com/science/2021/s… 2/ "I wrote this book first for my fellow scientists, who haven’t necessarily seen the relevance of genetics for their own work or have been afraid to incorporate it because of these associations."

Nothing new. BG has been trying to convince "scientists" of this for decades.