Abstract
Two rats that were reinforced with food for spacing their water licks at least 20 sec apart showed a licking pattern that alternated irregularly between low-rate (operant) licking and high-rate (polydipsic) licking. Intraperitoneal administration of 2 mg/kg of d,1-amphetamine sulfate just before a session caused the spaced, operant licking to increase in rate while at the same time the high-rate, polydipsic licking bursts decreased in duration and regularity.
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