Abstract
Five rats were exposed to fixed-time food schedules, ranging from 30 to 480 sec. Three rats displayed a postfood pattern of schedule-induced drinking, with short latencies from food delivery to drinking at all interfood interval durations. In contrast, drinking for the other 2 subjects tended to occur at lower overall levels, and drinking bouts frequently began in the middle of the interfood interval, such that the latency from food delivery to drinking increased dramatically as the interfood interval increased. Observation of these 2 subjects revealed that another form of licking-pawgrooming-occurred reliably after food delivery and before drinking bouts. A between subject comparison of the 3 postfood drinkers and the 2 pawgroomers revealed that, in addition to a common topography (repetitive licking), pawgrooming and drinking were similar with respect to their temporal locus, relation to the interfood interval, and extinction baseline levels. These similarities suggest that drinking and pawgrooming are induced by a common mechanism. Cohen, Looney, Campagnoni, and Lawler’s (1985) two-state model of reinforcer-induced motivation provides a useful framework for the interpretation of these results.
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We are especially grateful to Harry Mackay, Adam Reeves, and Jim Stellar for their careful review and helpful suggestions on early drafts of the manuscript. Clorinda Creo, Theodore Kozlowski, Rozana Troiano, Monique Antoine, and Daniel Tamkin provided invaluable help with running the experiment. Kathy Quist and Mark Krietz devoted many hours to learning the observational scoring system and establishing interrater reliability. This research was presented to the Graduate School of Arts and Sciences of Northeastern University by Cindy P. Lawler in partial fulfillment of the requirements for the doctor of philosophy degree. Preliminary data from this experiment were presented in March 1985 at the annual meeting of the Eastern Psychological Association in Boston, Massachusetts. The research was supported in part by OUSTS Grant RR07413 to Northeastern University.
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Lawler, C.P., Cohen, P.S. Temporal patterns of schedule-induced drinking and pawgrooming in rats exposed to periodic food. Animal Learning & Behavior 20, 266–280 (1992). https://doi.org/10.3758/BF03213381
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DOI: https://doi.org/10.3758/BF03213381