Abstract
We exposed 8 food-deprived male white rats to 20 experimental sessions with food reinforcement scheduled at fixed 60-sec intervals, and measured eat-drink latency, lick-bout duration, and local lick rate, as well as total water intake in a comparison with drinking under continuous reinforcement. The animals developed polydipsia over these sessions by taking increasingly frequent drinks with decreasing latencies as experience with the reinforcement schedule mounted. Local lick rate, however, did not change. The durations of these adjunctive drinks was also unchanged in average magnitude, but they became more stereotyped (less variable) from initial to terminal performance. We concluded that adjunctive drinking is conditionable in terms of frequency, latency, and variability in drink-bout duration, but not with respect to the local rate of licking or the average magnitude of lick-bout duration. This implies that distinct timing and volume regulation mechanisms are involved in the development of adjunctive drinking.
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Keehn, J.D., Stoyanov, E. The development of adjunctive drinking by rats: Conditioned and unconditioned components. Animal Learning & Behavior 14, 411–415 (1986). https://doi.org/10.3758/BF03200087
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DOI: https://doi.org/10.3758/BF03200087