Observations are reported of 5 rats, which had developed schedule-induced polydipsia and essentially stopped drinking, but not bar pressing, when they manipulated or chewed cellulose material from the excreta tray under the conditioning chamber. Polydipsia reappeared with removal of cellulose. This suggested that drinking was one of a number of inter-pellet behaviors depending upon available stimuli.
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Freed et al. (1969) studied this question.
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