Abstract
During the action of an extracellular polarizing current on neurons of the rabbit visual cortex electrical stimulation was applied to various hypothalamic nuclei (preoptic region, anterior hypothalamic region, lateral hypothalamus, mammillary bodies, and posterior hypothalamic nucleus). Hypothalamic stimulation was found to reduce the mean discharge frequency of most visual cortical neurons tested under conditions of anodal polarization, when the initial level of activity is considerably increased, than to a decrease in activity under conditions of cathodal polarization, when the initial level of activity is considerably reduced. The same tendency toward restoration of the initial (spontaneous) level of unit activity after hypothalamic stimulation was discovered when this level was shifted as a result of stimulation by regular flashes. The greatest effect was observed during stimulation of the preoptic region of the hypothalamus. Stimulation of the posterior hypothalamic nucleus was least effective in this respect.
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