Abstract
Two female albino rats, one (Rat FF) allowed free access to food throughout the experiment and the other (Rat FD) maintained at 80% of its free-feeding weight, were exposed to (1) baseline conditions with water freely available in both the home cage and test chamber and (2) baseline and free-reinforcement schedule (FFI-60-sec) conditions with free access to water in the test chamber and no access to water in the home cage. While home-cage water deprivation produced metabolic polydipsia in both subjects during test-chamber sessions, free-reinforcement schedule conditions produced schedule-induced polydipsia in Rat FD only. When under home-cage water-deprivation conditions (2), test-chamber water intakes of the subjects differed only during the free-reinforcement schedule condition even though both subjects had equal food-ingestion rates in the test chamber. Results were discussed with respect to previous explanations of schedule-induced polydipsia as a form of metabolic polydipsia.
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Brush, M.E., Schaeffer, R.W. Schedule-induced and metabolic polydipsia. Bull. Psychon. Soc. 5, 132–134 (1975). https://doi.org/10.3758/BF03333224
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DOI: https://doi.org/10.3758/BF03333224