Abstract
Rats maintained at 80 percent ad lib feeding body weight became hyperdipsic during 60 min FI-1 min food reinforcement sessions in standard rat operant test chambers. Animals were then allowed to return gradually to their ad lib feeding weight and were tested again in the same experimental chambers for 18 daily and 9 weekly sessions. Data were obtained for test sessions of 10, 30 and 60 min. When body weight recovered, schedule dependent lever pressing and eating as well as schedule induced licking and drinking occurred at reduced frequencies. The behavior endured throughout the test session and over periods as long as 80 days. These persistent and robust stereotyped behaviors are evoked by specific environmental stimuli during a resultant increased responsiveness.
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