Sex Differences in Variability in General Intelligence: A New Look at the Old Question

  title={Sex Differences in Variability in General Intelligence: A New Look at the Old Question},
  author={Wendy Johnson and Andrew D. Carothers and Ian J. Deary},
  journal={Perspectives on Psychological Science},
  pages={518 - 531}
The idea that general intelligence may be more variable in males than in females has a long history. In recent years it has been presented as a reason that there is little, if any, mean sex difference in general intelligence, yet males tend to be overrepresented at both the top and bottom ends of its overall, presumably normal, distribution. Clear analysis of the actual distribution of general intelligence based on large and appropriately population-representative samples is rare, however… 

A Role for the X Chromosome in Sex Differences in Variability in General Intelligence?

  • W. JohnsonA. CarothersI. Deary
  • Biology, Psychology
    Perspectives on psychological science : a journal of the Association for Psychological Science
  • 2009
The expected ratios of males to females at various points in the distribution are explored and the proportion of variance in general intelligence potentially due to genes on the X chromosome is estimated, providing clues to the extent to which biologically based sex differences could be manifested in the environment as sex differences in displayed intellectual abilities.

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Consistencies in Sex Differences 1 Running Head : SEX DIFFERENCES ON THE COGNITIVE ABILITIES TEST Consistencies in Sex Differences on the Cognitive Abilities Test across Countries , Grades , and Cohorts

Recently, Strand, Deary, and Smith (2006) reported sex differences for over 320,000 students 11-12 years old on the Cognitive Abilities Test. Although mean differences were small, score distributions

Sex Differences in Intelligence and Brain Size: A Developmental Theory.

The distribution of intelligence.

  • C. Burt
  • Psychology
    British journal of psychology
  • 1957
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This paper is the outcome of prolonged reflection on the doctrine of greater male variability. It comprises an attempt to assemble and review briefly data at present accessible as to the comparative

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Contemporary research on sex differences in intellectual abilities has focused on male-female differences in average performance, implicitly assuming homogeneity of variance. To examine the validity

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