Primary, click-evoked potentials were examined in barbiturate-anesthetized cats. Electrolytic lesions were placed stereotaxically at various points in the medial geniculate nucleus 4 days to 3 wk prior to electrophysiological recording and the location and extent of destruction was evaluated histologically after physiological recording. Bipolar surface potentials were mapped in cortical areas AI, AII and Ep. Systematic changes in the evoked potential maps were observed which were specifically related to the location and extent of the medial geniculate destruction. The greatest effect on the evoked potentials was associated with ventral division lesions, and a much smaller effect was observed with medial and dorsal division lesions. In general, the results agree with those predicted from anatomical studies of the auditory thalamocortical projection system. © 1973.
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