Two experiments with 43 Charles River (cd) male rats investigated the effects of schedule, percent body weight, and magnitude of reinforcer on the acquisition of schedule-induced polydipsia. A leaner reinforcement schedule induced greater polydipsia as did two non-schedule variables, reduced body weight and small magnitude of reinforcer. These findings, related to contemporary theories of schedule-induced polydipsia, emphasize the role of non-schedule variables in this behavior.
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