Verbal and visuospatial abilities are typically subserved by different cerebral hemispheres: the left hemisphere for the former and the right hemisphere for the latter. However little is known of the origin of this division of function. Causal theories propose that functional asymmetry is an obligatory pattern of organisation, while statistical…

Evidence gathered from commissurotomy (split-brain) patients and right-hemisphere/left-hemisphere studies on normal intact humans is reviewed and evaluated. Concludes that right-left hemisphere differences reported in normal subjects are small and that there is no scientific basis for any reorganization of curricular, teaching, or testing…

In an investigation using auditory evoked responses (AERs) to compare strongly left- and strongly right-handed adults in their hemispheric processing of speech materials, it was anticipated that AERs would reflect a bilateralization in the left-handed group of subjects and marked hemispheric differences in the right-handed group. In addition, the…

Examined the hypothesis that aging and hemispheric laterality interact to produce relatively greater decrements in older individuals in right hemispheric dominant (visuospatial) than left hemispheric dominant (verbal) tasks in 24 early middle-aged and 24 older males. Data did not support the notion of a laterality effect associated with aging.…

The cognitive processing strategies of two groups of French-English bilinguals were studied by means of an auditory Stroop test designed to evaluate cerebral hemispheric involvement. An "early bilingual" group were bilingual before the age of five, and a "late bilingual" group were bilingual after the age of ten. Stimuli were…

Relationships between brain-lesion location and behavior in 33 males and 31 females with unilateral lesions were studied. Statistical tests suggest that a single model can describe the relationships for females, but in males separate models of the relationships between lesion location, verbal intelligence quotient, and performance intelligence…

Sex differences in cerebral organization and functioning, and the apparent superiority of males in spatial ability are examined in this paper. Attention is given to several kinds of cognitive and perceptual tasks in which sex differences in spatial ability have been shown to exist; among these are tasks involving: (1) recall and detection of…