[Functional organization of the callosal connections in the auditory cortex of the cat].

Homotopic transcallosal potentials of the cat auditory cortex primary projection area (AI) had the greatest amplitude, the minimal temporal parameters and the maximal stability of characteristics as compared with the responses of the auditory cortex associative fields AII, AIV, Ep. Heterotopic transcallosal responses in the AI field occurred in stimulation of the field under the same name whereas in the Ep field the responses occurred both in stimulation of the same and the AI and AII fields of the opposite hemisphere. The structure of transcallosal connections of the auditory cortex primary projection field seems to be characterized by homotopy whereas in associative fields the role of heterotopic transcallosal interactions seems to increase. Such a structure of transcallosal connections seems to maintain the important role of interhemispheric interaction in mechanisms of spatial hearing.