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Effect sizes and meta-analysis indicate no sex dimorphism in the human or rodent corpus callosum

Published online by Cambridge University Press:  01 June 1998

Douglas Wahlsten
Affiliation:
Department of Psychology, University of Alberta, Edmonton, Alberta T6G 2E9, Canadawahlsten@psych.ualberta.ca
Katherine M. Bishop
Affiliation:
Department of Psychology, University of Alberta, Edmonton, Alberta T6G 2E9, Canadawahlsten@psych.ualberta.ca

Abstract

Sex dimorphism occurs when group means differ by four or more standard deviations. However, the average size of the corpus callosum is greater in males by about one standard deviation in rats, 0.2 standard deviation in humans, and virtually zero in mice. Furthermore, variations in corpus callosum size are related to brain size and are not sex specific.

Type
Open Peer Commentary
Copyright
© 1998 Cambridge University Press

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