Perceptual learning enhances retrospective revaluation of conditioned flavor preferences in rats |
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Authors: | Balleine Bernard W Espinet Alfredo González Felisa |
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Affiliation: | Department of Psychology, University of California, Los Angeles, 90095, USA. balleine@psych.ucla.edu |
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Abstract: | Forward and backward blocking of taste preference learning was compared in rats. In the forward condition, thirsty rats were exposed to a flavor (A) in sucrose solution (+) or in water (-), after which they were exposed to A in compound with another flavor (B) in sucrose solution (i.e., AB+). In the backward condition, these phases were reversed. Consumption of B alone was assessed when rats were food deprived. In the forward condition, rats given A+ consumed less B than rats given A-, providing evidence of forward blocking, whereas in the backward condition, rats given A+ drank more of B than those given A-. Subsequent experiments found that alternating but not blocked preexposure to A and B, when given prior to training, produced blocking of B whether A+ was given before or after AB+, suggesting that prior failures to observe backward blocking reflect failures of discrimination. |
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