ACTIVATION PATTERN IN LOWER LEVEL IN THE NEO-, PALEO-, AND ARCHICORTICES

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Abstract
High amplitude 10-15 cps (sometimes down to 4-8 cps or up to 20 cps) rhythmic waves named as the "activation pattern in lower level" in the neo-, paleo-, and archicortices were studied on the curarized cats. The activation pattern in lower level occurred after the administration of the narcotics and tranquillizers. Meprobamate and a small dose of barbiturate easily produced this pattern only in the neocortex. In the recovery process from deep anesthesia, this pattern was observed often first in the amygdala and pyriform lobe, then in the hippocampus and last in the neocortex. The same pattern in all cortical and subcortical areas was easily obtained by injection of the central excitant (caffein or megimide) to the deeply anesthetized animal. The activation pattern in lower level was observed more easily in the hippocampus than in the neocortex and paleocortex under the conditions of lowered activity level in the paleocortex and amygdala was also observed after administration of a large dose of chlorpromazine. EEG patterns in the neo-, paleo-, and archicortices were classified into 5 different levels corresponding to the activity levels of the animal''s behaviour.