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All sex differences in cognitive ability may be explained by an X-Y homologous gene determining degrees of cerebral asymmetry

Published online by Cambridge University Press:  04 February 2010

T. J. Crow
University Department of Psychiatry, Wameford Hospital, Oxford OX3 7JX, United Kingdom,


Male superiority in mathematical ability (along with female superiority in verbal fluency) may reflect the operation of an X-Y homologous gene (the right-shift-factor) influencing the relative rates of development of the cerebral hemispheres. Alleles at the locus on the Y chromosome will be selected at a later mean age than alleles on the X, and only by females.

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