[Comparative characteristics of the interhemispheric asymmetry of transcallosal responses of the projection and association areas of the cortex].

Homo- and heterotopic transcallosal responses from projective and associative cortical areas were studied in 57 immobilized cats. Homotopic potentials revealed a functional interhemisphere asymmetry of their amplitudes. The latters were higher in visual and somatosensory cortex of the right hemisphere, whereas in sensomotor cortex the amplitude of both components of the homotopic EPs was higher in the left hemisphere. Heterotopic transcallosal responses were more symmetrical. The projective and associative areas differed in that the associative cortex revealed a more symmetrical distribution of the heterotopic EPs. The above features of the EPs seem to stem from the asymmetrisizing effect of homotopic callosal pathways and from symmetrisizing effect of intrahemisphere associative projections.