[Sex differences in the penetrance and expressivity of interhemispheric asymmetry]

In 38 anesthetised cat of both sexes, homotopic transcallosal responses (HTR) were studied in somatosensory, visual, auditory and temporal cortex of the brain. High penetration in cases of interhemispheric asymmetry was more specific for males and found mostly in cortical projection areas. For the functional interhemispheric asymmetry of the HTR amplitude-temporal parameters a high degree of expressiveness was characteristic in female cats. Possible reasons of these phenomena are discussed.