There are a lot of cross-racial behavioral genetic studies that support hereditarianism, but environmentalists have one 1961 paper they can point to. After World War II, Germany was occupied by the Allies, and sometimes the women of that country had children with soldiers from abroad. The psychologist Klaus Eyferth tracked some of these children down in the American and French zones of occupation when they were between 5 and 13 years of age and gave them IQ tests. In a 1961 paper, he compared the fully white offspring of soldiers to those with a father of African descent.
Here is the original article, and below is an English translation I got from ChatGPT.
Overall, the study included 181 colored occupation children, excluding 11 from the IQ analysis for being too young, and 83 white occupation children, of which 2 were excluded on the same grounds. The IQs of both groups ended up being practically identical, with about a 0.7-point difference in favor of the whites. This is obviously much smaller than you would expect in a study involving mixed-race children given the IQ gaps between whites and blacks that we have traditionally seen in the US. Eyferth tried to match the white and colored children on socioeconomic characteristics, and sometimes found both types of occupation offspring in the same classroom.
Eyferth reports whites doing better among males and the colored group scoring higher among females.
This is not a paywall. The rest of this article is available to free subscribers of the newsletter. Just leave your email below to continue reading.
>with a rejection rate for Blacks on the preinduction Army General Classification Test of about 30%, compared with 3% for Whites.
This is the key point that undermines the whole article. And the rejection rate disparity doesn't even count people who self-rejected due to expected failure.
I mean cmon, "no disparity in the IQs of the children of black and white olympiad finalists" doesn't show anything at all.
"It is too bad that the Eyferth study is the product of a unique historical moment, meaning that it can’t be replicated,"
Of course it can be replicated. The U.S. has based troops in Germany for 80 years and countless half-black half-German children have been born, such as the late Rob Pilatus of Milli Vanilli and numerous members of the U.S. men's national soccer team who have participated for the U.S. in the World Cup (such as Malik Tillman, Jermaine Jones, John Brooks, and Timothy Chandler). U.S. men's national team soccer coaches traditionally like black nature and German nurture.
The Eyferth study could have been replicated at any point in the 65 years since 1961. Sadly, I've never heard of a replication.