Abstract
Eight males and eight females in each of four handedness groups (right- and left-handers with and without familial sinistrality) participated in verbal and nonverbal dichotic listening and tachistoscopic tasks. It was found that handedness, familial sinistrality and sex all affect hemispheric specialization. However, the effects of these factors differed according to the task involved. In general, left-handedness (and familial sinistrality) was associated with atypical or bilateral hemispheric specialization. Sex interacted with handedness and familial sinistrality in the lateralization of the auditory tasks used in this study. Males were more strongly lateralized for speech-processing whereas right-handed females were more strongly lateralized for processing nonspeech auditory stimuli (environmental sounds and melodies). Sex did not influence processing of the visually-presented (words and faces) stimuli in this study.
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