Experiments were carried out on 19 adult cats with chronic brain stem transections at the level of the foremost border of the supperior colliculus. High-frequency electric stimulation of the posterior hypothalamus produced in these cats desynchronization of electrical activity in different parts of the neocortex. A predominant influence from the posterior hypothalamus on the electrical activity of frontal lobes was observed. On the basis of the obtained data, it is suggested that the influences from posterior hypothalamus elicit neocortical activation via thalamic nuclei.
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