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The scientific premises for looking for statistical differences between groups designated as races (on somewhat arbitrary grounds) are questionable. The explanation of such differences in strictly biological-evolutionary terms is even more dubious. Studies of temperament, basic personality traits, disorders (such as antisocial personality), and specific genetic markers show that there is much more variation within groups designated as races than between such groups. Investigators and theoreticians interpreting such differences on the basis of limited sampling within the three broad racial groups should be careful to avoid selectivity and misrepresentation of data that serve racist ideology, and should be cautious about presenting their theories to the public through inappropriate media forums.
Marvin Zuckerman (Mon,) studied this question.