Abstract

In chronic experiments on cats after premesencephalic section of the brain stem electrical stimulation of the posterior hypothalamus evoked desynchronization of neocortical electrical activity. After isolated injury to the posterior hypothalamus, moderate electrical stimulation of the medial part of the mesencephalic reticular formation did not evoke any marked activation of the neocortex. The results point to the important role of the hypothalamus in the activity of the ascending activating system.

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