I don't believe this research....advocating these types of "theories" are reminiscent of eugenicists during the Nazi era....
"The finding is based on 307 children in Bethesda, Md., an affluent suburb of Washington. Starting in 1989, they were given regular brain scans using magnetic resonance imaging, a project initiated by Dr. Judith Rapoport of the National Institute of Mental Health."
Oh I believe the research, what I like to know is the rest of the story. We were not told of the "race" of the children only that they were of wealth.
The scan differences are facts, the explanations are theoretical.