Deprivation level and choice in pigeons: a test of within-trial contrast |
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| Authors: | Vasconcelos Marco Urcuioli Peter J |
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| Institution: | Department of Psychological Sciences, Purdue University, West Lafayette, Indiana 47907-2081, USA. marcov@psych.purdue.edu |
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| Abstract: | Within-trial contrast has been proposed as a mechanism underlying preferences for stimuli that follow relatively more aversive
events over stimuli that follow less aversive events. In this study, we manipulated deprivation level to test within-trial
contrast predictions. In Experiment 1, pigeons encountered two discriminative stimuli, one presented when they were deprived
and the other when they were prefed. When later given a choice between the two stimuli, pigeons strongly preferred the stimulus
encountered when deprived, independently of their deprivation level at test. In Experiment 2, pigeons learned two simultaneous
discriminations, one when deprived and the other when prefed. Here, subsequent tests between the two S+ or the two S− stimuli revealed no consistent preferences. These contrasting findings suggest that differential aversiveness is necessary
but not sufficient to induce preferences via within-trial contrast. |
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