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Using a 2-lever choice paradigm with concurrent variable interval schedules of reward, it was found that when pulse frequency is increased, the preference-determining rewarding effect of 0.5-s trains… (More)
Rats with an electrode in the medial forebrain bundle (MFB) in or near the ventral tegmental area and another at the level of the rostral hypothalamus sustained large electrolytic lesions at either… (More)
This experiment examined whether operant blocking could explain instructed behavior's insensitivity to contingencies. Fourteen subjects were randomly assigned to three groups and trained to respond… (More)