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Modulation of schedule-induced polydipsia by Pavlovian conditioned states

Authors
Journal
Physiology & Behavior
0031-9384
Publisher
Elsevier
Publication Date
Volume
24
Issue
2
Identifiers
DOI: 10.1016/0031-9384(80)90108-0
Keywords
  • Schedule-Induced Polydipsia
  • Pavlovian Conditioning
  • Random-Time Schedules
  • Rats

Abstract

Abstract It has previously been porposed that Random-Interval schedules fail to induce polydipsic drinking in rats because such schedules fail to provide gradients of reinforcement probability. In the present study, food-deprived rats received single pellet meals delivered on either a Fixed-Time or a Random-Time 120-sec schedule, with half of each group receiving signalled, and half unsignalled, pellet deliveries. Acquisition of polydipsia was retarded in animals exposed to the Random-Time Unsignalled condition. However, the imposition of a CS+ for pellet delivery on the identical Random-Time schedule resulted in levels of polydipsia comparable to those obtained in both Fixed-Time conditions. These results suggest that the establishment of a Pavlovian conditioned inhibitory signal, as well as local periods of low reinforcement probability, may be sufficient for the development of schedule-induced behaviors such as polydipsia.

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