Abstract
Rats with ventromedial hypothalamic (VMH) lesions and sham operated animals were allowed 20 min of access to a solution of sweetened condensed milk. After drinking the substance, the animals received intraperitoneal injections of either saline or methylatropine (1.0 mg/kg). The rats injected with methylatropine demonstrated reduced intake of the test solution when it was next presented. This conditioned gustatory aversion was more pronounced and more resistant to extinction in the rats with VMH lesions. The results support the hypothesis that VMH lesions increase responsivity to interoceptive cues associated with illness as well as to exteroceptive cues associated with consummatory responding.
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