The Scientific Review of Mental Health Practice

Objective Investigations of Controversial and Unorthodox Claims in Clinical Psychology, Psychiatry, and Social Work

Head Size as an Explanation of the Race–Measured IQ Relation

Negative Evidence from Child and Adolescent Samples

Author:
Thomas E. Joiner Jr., Department of Psychology, Florida State University.

Author Note:
The author is indebted to several people who commented on earlier versions of this paper. Correspondence concerning this article should be addressed to Thomas E. Joiner Jr., Department of Psychology, Florida State University, Tallahassee, FL 32306-1270. E-mail: joiner@psy.fsu.edu.

Abstract:
Proponents of a genetic/biological account of racial differences in measured IQ have argued that people of African descent possess lesser cognitive ability because they possess fewer cortical neurons (as reflected by head/brain size), and they possess fewer cortical neurons, according to this model, because of evolutionary forces associated with being of African descent. In this paper, I argue that the evidence for this claim is questionable; moreover, I provide new analyses that contradict the genetic/biological model of racial differences in measured IQ.


You can read the full text of this article in
The Scientific Review of Mental Health Practice, vol. 3, no. 1 (Spring/Summer 2004).
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