Lateralization of speech production using verbal/manual dual tasks: meta-analysis of sex differences and practice effects.

Neuropsychologia

Cognitive Psychophysiology Laboratory, School of Psychology, University of Queensland and Queensland Health, Edith Caval Building, Herston, Brisbane, Australia.

Published: September 2002

The present paper reviews the findings of 30 years of verbal/manual dual task studies, the method most commonly used to assess lateralization of speech production in non-clinical samples. Meta-analysis of 64 results revealed that both the type of manual task used and the nature of practice that is given influence the size of the laterality effect. A meta-analysis of 36 results examining the effect size of sex differences in estimates of lateralization of speech production indicated that males appear to show slightly larger laterality effects than females.

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http://dx.doi.org/10.1016/s0028-3932(01)00228-7DOI Listing

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