Abstract
Four groups of four rats were tested on a fixed-time (FT 60-sec) schedule in which one, three, or five pellets per food delivery and 0%, 8%, 16%, and 32% sucrose pellets were factorially combined. The results showed no statistically significant differences in water intake associated with sucrose content of the pellets, but did show a significant inverse relationship between water intake and number of pellets given per reinforcement. This latter finding was interpreted as a result of the direct relationship in the rat between total number of reinforcement opportunities and probability of drinking. This relationship was suggested to be an important dependent variable in studies that measure and attempt to account for collateral fluid ingestion.
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