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Neo cortical and hippocampal electro encephalogram in normal and lateral hypothalamic damaged rats



Neo cortical and hippocampal electro encephalogram in normal and lateral hypothalamic damaged rats



Physiology and Behavior 20(4): 403-410



Cortical and hippocampal EEG were correlated with behavior in rats before and after bilateral lateral hypothalamic (LH) damage. In Stage 1 of recovery (aphagia and adipsia), the neocortex showed continuous large amplitude slow activity. It did not desynchronize during spontaneous acts such as grooming as well as during tail pinch-induced struggling or orienting, even though a slow form of hippocampal .theta. accompanied these acts. However, during Stage 2 (anorexia), the neocortical EEG did desynchronize when such .theta. appeared. As behavioral recovery progresses after LH damage, there appears to be a concomitant recovery of cortical participation in such behavior. Early in recovery, LH rats, unlike normals, showed slow (3-4.5 Hz) atropine-sensitive hippocampal .theta. during automatisms such as grooming as well as during immobility. Thus, LH damage, while temporarily abolishing fast, noncholinergic .theta., appears to release slow cholinergic .theta. Later in recovery, faster atropine-resistant (noncholinergic) .theta. becomes functional again.

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