Rats trained to space bar presses 20 sec. apart for dry food reinforcement engaged in water drinking during the intervals between bar presses. When 1.5 mg/kg dl-amphetamine was administered, bar pressing rate increased while the incidence of water drinking decreased. Drinking occurred only after the delivery of food pellets.
Amphetamine Discriminative Stimulus Water Trough Collateral Behavior Food Reinforcement Schedule
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