Choice for conditioned reinforcers in the signaled absence of primary reinforcement |
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| Authors: | Horney J Fantino E |
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| Affiliation: | UNIVERSITY OF NEBRASKA AT OMAHA AND UNIVERSITY OF CALIFORNIA, SAN DIEGO |
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| Abstract: | Pigeons responded in a multiple schedule in which concurrent schedules of brief-stimulus presentation alternated with a component in which food was available (concurrent-chains component). In the initial links of the concurrent-chains component subjects chose either of two stimuli each correlated with the terminal link of one chain. The terminal links involved either variable-interval 30-second or variable-interval 60-second schedules. In the brief-stimulus component subjects chose between 0.5-second presentations of the terminal-link stimuli from the concurrent-chains component. Responding was generally maintained in the brief-stimulus component in two subjects for more than 300 sessions, suggesting that brief stimuli were conditioned reinforcers. During the brief-stimulus component, in 17 of 21 cases for which a minimal number of responses occurred, choice proportions above 0.55 were obtained for the brief-stimulus presentations correlated with the higher rate of primary reinforcement in the concurrent-chains component. These results support the suggestion that choice in conventional concurrent-chains procedures is partially controlled by production of the terminal-link stimuli. |
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| Keywords: | conditioned reinforcement choice brief-stimulus presentations multiple schedules concurrent-chains schedules delay-reduction hypothesis variable-interval schedules key peck pigeons |
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