Abstract
Ten Wistar rats were exposed to a modified fixed-interval food reinforcement schedule in which 60-s extinction intervals and continuous reinforcement periods of 1- to 200-pellet blocks alternated [mixed EXT 60-s FR-1 (n)]. Water was available in both components of the mixed schedule so that both prandial drinking (within reinforcement blocks) and adjunctive drinking (between reinforcement blocks) were possible. Within-block drinks increased with block size, but were rare with blocks of up to 15 pellets. With more than 25 pellets per block, within-block drinks were frequent and water intake per session was no higher than baseline. Between 1 and 15 pellets per block, drinking was mostly adjunctive, and water intake per block rose monotonically with block size.
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Parts of the data were reported at the First European Meeting on the Experimental Analysis of Behavior, Liege, 1983, and at the 20th International Congress of Psychology, Acapulco, 1984. We thank Jill Worthy for assistance with Group 1, Nick Keehn for assistance with Group 2, and Jackie Logan for preparing the manuscript. Financial support was provided by a grant from the Natural Science and Engineering Research council of Canada to Emoke Stoyanov and from Atkinson College to J. D. Keehn.
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Keehn, J.D., Stoyanov, E. Adjunctive Drinking in a Mixed Reinforcement Schedule: Effect of Reinforcement Magnitude on Schedule-Induced Polydipsia. Psychol Rec 36, 553–561 (1986). https://doi.org/10.1007/BF03394973
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DOI: https://doi.org/10.1007/BF03394973