> "The test performance of the Black/Black adoptees [in the study] was not different from that of ordinary Black children reared by their own families in the same area of the country. My colleagues and I reported the data accurately and as fully as possible, and then tried to make the results palatable to environmentally committed colleagues. In retrospect, this was a mistake. The results of the transracial adoption study can be used to support either a genetic difference hypothesis or an environmental difference one (because the children have visible African ancestry). We should have been agnostic on the conclusions."

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It gets back to the main issue here. You can't expect an open and good faith discussion on this topic when any one can suffer major career and other consequences for not adopting the politically correct view. And indeed extremely compelling evidence to the contrary of such is immediately met with a mixture of logically flawed arguments (e.g. - various groups have suffered tremendous discrimination with no apparent impact on IQ or later achievement, Jews being the obvious example) and ad hominem.

The study results are obviously not what the author's expected to find, which left them in a very difficult place. I think that is also why this was the last effort to try to experimentally prove that genetics don't matter. This is also likely why they continue to insist that the almost exactly ~20% of the mixed race individuals were misclassified by accident. Had they shown an environmentally favorable argument, I suspect it would have been revealed as a rather cleverly concocted control group. As is, it's extremely difficult to explain this (the mixed race individuals believed they were black and appeared as such, yet tested in accordance with their genetics) with a typical environmental argument.