Abstract
Bar-pressing on FR schedules for sucrose rewards was studied in rats with ventromedial hypothalamic (VMH) lesions. When both VMH and control rats were maintained on ad lib feeding, their bar-pressing performance for sucrose did not differ, but if the VMH group was maintained at control body weight levels, they responded more frequently for sucrose than controls. In a subsequent experiment performance for Noyes pellets and 32% sucrose was directly compared in VMH and control animals maintained at 85% of their respective postoperative body weight levels. Under these conditions controls responded more frequently than lesioned rats for either type of reinforcement, but the magnitude of the difference was greater with the Noyes pellet reward.
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