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Related Experiment Videos

Race, brain size, and intelligence: a reply to Cernovsky.

J P Rushton1

  • 1Department of Psychology, University of Western Ontario, London, Canada.

Psychological Reports
|April 1, 1990
PubMed
Summary
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This study examines brain size in relation to race and intelligence, refuting claims of sex differences in intelligence. Findings suggest evolutionary reproductive strategies influence these traits across racial groups.

Area of Science:

  • Anthropology
  • Neuroscience
  • Genetics

Background:

  • Critique of previous work on brain size and IQ.
  • Clarification of author's position on sex differences and brain size.
  • Addressing Cernovsky's misinterpretations of research findings.

Purpose of the Study:

  • To review evidence on the relationship between brain size and race.
  • To review evidence on the relationship between brain size and intelligence.
  • To explore evolutionary explanations for observed differences.

Main Methods:

  • Review of existing autopsy and population data.
  • Analysis of brain size in relation to racial groups (Mongoloid, Caucasoid, Negroid).
  • Tabulation of data for personality, maturation speed, and sexuality.

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Main Results:

  • Male-female brain size difference is eliminated when body size is controlled.
  • Black-white brain size difference persists after controlling for body size.
  • Mongoloid populations exhibit larger brain sizes than Caucasoids.

Conclusions:

  • Reiteration that sex differences in brain size were not the focus.
  • Observed variations in brain size, intelligence, and other traits across racial groups.
  • Hypothesis that evolutionary r/K reproductive strategies may explain these patterns.