EFFECT OF HYPOTHALAMIC LESIONS ON ELECTRICAL ACTIVITY OF CEREBRAL CORTEX

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Abstract
The spontaneous electrical activity of the brain was recorded in cats through bipolar electrodes in contact with the dura and the effect of different lesions was observed. The lesion of the hypothalamic and basal portion of the brain completely abolished the spontaneous activity of the cerebral cortex in acute expts., of 1 or 2 hrs. duration. The cortical activity also disappeared after lesions of the thalamus or its thalamo-cortical pathways. It seems that the hypo-thalamus may influence cortical activity through its thalamic connections and perhaps by way of the medial thalamic region. Section through the midbrain, even at the rostral level of the superior colliculi bodies, diminishes but does not entirely abolish the cortical activity.

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