Value of conditioned reinforcers as a function of temporal context |
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| Affiliation: | 1. Persian Gulf Physiology Research Center, Medical Basic Sciences Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran;2. Department of Physiology, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran;3. Division of Clinical and Computational Neuroscience, Krembile Brain Institute, University Health Network, Toronto, ON, Canada;4. Department of Pharmacology, School of Pharmacy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz Iran;1. Neuroscience Research Center, Neuropharmacology Institute, Kerman University of Medical Sciences, Kerman, Iran;2. Neuroscience Research Center, Aja University of Medical Sciences, Tehran, Iran;3. Physiology Research Center, Institute of Basic and Clinical Physiology Science, Kerman University of Medical Sciences, Kerman, Iran;4. Endocrinology and Metabolism Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, Iran;5. Neuroscience Research Center, Neuropharmacology Institute, Department of Physiology and Pharmacology, Kerman University of Medical Sciences, Kerman, Iran;1. College of Life Sciences and Key Laboratory of Bioactive Materials Ministry of Education, Nankai University, 300071, Tianjin, PR China;2. Ningbo Medical Center Lihuili Eastern Hospital, 315040, Ningbo, Zhejiang, PR China |
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| Abstract: | In two experiments, pigeons were trained on a multiple-chain schedule, in which the initial link for one chain was a variable-interval (VI) 100 s schedule and for the other chain a VI 10 s schedule. The terminal links were both fixed-time 30 s schedules signaled by differently colored stimuli. Following training, the pigeons had their preference for the terminal-link stimuli tested either by presenting these stimuli in concurrent probes or by presenting these stimuli as reinforcement for completing novel initial links. In Experiment 1, pigeons significantly preferred the terminal-link stimulus that followed the long initial link in three of the five conditions. This preference was observed across all three testing procedures (concurrent chains, concurrent chains probes, and concurrent probes). Experiment 2 was a replication of this effect in one of the conditions from Experiment 1. The results demonstrate that temporal context does impact the value of a conditioned reinforcer in a manner consistent with delay-reduction theory, and inconsistent with other choice theories, such as the contextual choice model and scalar expectancy theory. |
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