| Abstract: | Evoked potentials (EPs) to clicks were recorded in the ectosylvian and sigmoid gyri of the cortex, in the medial geniculate body, and in the median nucleus of the thalamus by means of permanently implanted electrodes in experiments on 14 cats. A motor component of the behavioral response (conditioned food reflex) developed in response to the same stimulus (clicks). In the first group of animals the region of destruction was confined to the globus pallidus. In these animals EPs to clicks appeared during the first days after the operation in all structures, although in some tests they were reduced. Meanwhile the behavioral response to clicks was absent and showed no signs of spontaneous recovery. It could be formed (retraining) later in the experiments. In the second group of animals the globus pallidus was not completely destroyed, but neighboring areas of the entopeduncular nucleus and internal capsule were coagulated. In these cats more marked changes in behavioral and electrophysiological indices were observed. EPs to clicks disappeared in some cases for 25–30 days, subsequently returning to normal. The role of the globus pallidus as a "non-specific" polymodal structure in the analysis of sensory information is discussed.A. A. Bogomolets Institute of Physiology, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Neirofiziologiya, Vol. 4, No. 2, pp. 141–149, March–April, 1972. |
