Abstract
Aversion that is produced supraspinally in rats by stimulation of the nucleus reticularis gigantocellularis (NGC) is reduced by concurrent stimulation of lateral hypothalamus (LH) at intensities that are otherwise non-rewarding. Electrolytic lesions of medial thalamus consistently increase the LH stimulation threshold for reducing aversion. These lesions do not alter stimulation threshold for the rewarding property of LH stimulation or the aversive property of NGC stimulation. We propose that medial thalamus is part of a forebrain aversion-gating mechanism that may be engaged by increased activity in the lateral hypothalamus.
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