בקשר ל-IQ שמשקף גודל פיזי במוח הוא מראה שזה הרוב לא גורם סביבתי אלא גנטי.
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Q: But don't most experts believe that the cause of race differences in IQ is environmental, not genetic?
A: A survey done by Mark Snyderman and Stanley Rothman in the 1987 American Psychologist found that a majority (52%) of scientists said the Black-White IQ difference was partly genetic. Only 17% said it was entirely cultural. More recently, a special task force of the American Psychological Association agreed that there was a three-way pattern of race differences in brain size and IQ. Perhaps because of political correctness, the Task Force threw up its hands about the causes and decided to play it safe by saying "no one knows why" (see the 1996 and 1997 issues of the American Psychologist.). "
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