Since very few American blacks are pure black any more, I wonder how many of the blacks tested have what percentage of white or asian blood in them.
I believe studies have been proposed to assess the IQ levels of blacks while simultaneously evaluating DNA for racial admixture. Didn't go over too well! The Bell Curve showed Asians with the highest IQ, whites next and blacks last. The disappointing thing about the nurture theory is that when children of successful upper middle class blacks are tested, they still have lower scores. I have never seen anything on the test scores on the parents of these black children. I read an article by Charles Murray about 6 months ago in the WSJ. I wish I were as smart as he but I believe I recalled he noted this increase in black IQ but there are several measurements within the IQ system and the most important one (I cannot remember its name) did not seem to be improving in the black children.