Abstract

Dorsolateral and medial neocortical areas of the cat's brain were stimulated with single shocks of 15 V, and responses were recorded from the septum, hippocampus and amygdala. The predominant relationships resulting from this method are as follows: 1. 1. Stimulation of the sylvian, ectosylvian, inferior portions of the lateral and suprasylvian gyri, and the sigmoid, coronal and cingulate gyri evoke responses from the septum. 2. 2. With the exception of the sigmoid gyrus, stimulation of these same cortices, together with the medial lateral and suprasplenial gyri, more consistently evoke responses from the basal and lateral amygdala and from the dorsal and ventral hippocampus. 3. 3. More specific cortico-limbic relations demonstrated by the evoked potential method are: (a) the sigmoid gyrus is related to the basal amygdala and ventral hippocampus; (b) the lateral gyrus is related to the dorsal hippocampus and (c) the suprasylvian gyrus is related to the dorsal and ventral hippocampus. 4. 4. With the exception of most of the areas of the medial surface, but with few exceptions of those of the dorsolateral surface, strychninization of the same cortical areas evoked strychnine spikes from the septum, amygdala and hippocampus. 5. 5. Functional implications of neocortico-limbic relations are discussed.

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