Abstract
The role of incentive learning in instrumental performance following an upshift in the degree of water deprivation was analyzed in three experiments. In Experiments 1A and 1B, rats trained to perform an instrumental action reinforced by either sucrose or maltodextrin solutions when in a low-deprivation state were shifted to a high-deprivation state and tested in extinction. This shift in water deprivation increased performance only if the animals had been exposed to the reinforcer in the high-deprivation state prior to testing. In Experiment 2, the role of the instrumental contingency in mediating the preexposure effect observed in the first two studies was examined by training rats to make two instrumental actions for different outcomes. The preexposure experience with the outcomes produced a relative increase in performance of the action reinforced with the incentive preexposed in the high-deprivation state when a choice between the two response alternatives was conducted in that state. These experiments support the conclusion that instrumental performance following revaluation of the reinforcer by an upshift in the level of thirst depends on a process of incentive learning.
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This research was supported by grants from the Spanish Ministerio de Educación y Cultura to M. López (Dirección General de Investigación Científica y Técnica, PB96-0561) and to C. Paredes-Olay (Becas de FPI-AP93).
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López, M., Paredes-olay, C. Sensitivity of instrumental responses to an upshift in water deprivation. Animal Learning & Behavior 27, 280–287 (1999). https://doi.org/10.3758/BF03199726
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DOI: https://doi.org/10.3758/BF03199726