Abstract
Polydipsia was induced in four female rats reduced to 80% of their free-feeding weights and exposed to a 120 sec response-independent fixed-time (FT) schedule of food delivery. Animals were then presented with either one, two, three or six 45 mg Noyes food pellets per interval. For three animals the multiple pellet per interval conditions resulted in increased water consumption over the single pellet condition. The two, three and six pellet conditions, however, resulted in similar amounts of water being ingested. These results indicated that an increase in the magnitude of reinforcement beyond a certain limit does not lead to an increase in schedule-induced polydipsia.
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