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Summary, The relationship between anatomical sizes of different regions of the corpus callosum and functional visuospatial skills was investigated in 24 fight-handed students (12 males and 12 females) using midsagittal magnetic resonance imaging (MRI). Men had significantly larger absolut ca[losal areas and in some cases wider callosal measurements than women but there were no sex differences in relative sizes of the corpus callosum compared to the total brain. The results showed a tendency toward male superiority in solving visuospatial tasks, some subtests even reached a high significance favoring males. Both sexes showed a strong negative correlation between the size of the corpus callosum and enhanced visuospatial skills. These findings indicate that the corpus callosum plays a minor role in interhemispheric communication of higher order cognitive processing.

64 ischemic stroke patients with angiographically verified occlusion of the internal carotid artery were studied. 32 patients underwent surgical revascularization in the acute stage within a few hours of acute onset of stroke. 32 patients had conservative management of treatment. Both groups were compared in regard to mortality rate, functional recovery and clinical findings or neurological deficits and psychiatric disturbances on admission and 4 weeks later. Correlations of functional recovery between the two groups showed no significant differences. Mortality rate in the conservatively managed group however was significantly lower than in the operative group.

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Twenty patients (mean age ± standard deviation, 42 ± 14 yr) with multiple sclerosis were studied to define a possible relation between cognitive decline and pathology seen on mag-