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. 1990 Mar;53(2):235–246. doi: 10.1901/jeab.1990.53-235

Delay and number of food reinforcers: Effects on choice and latencies

Richard L Shull, Robert C Mellon, Jennifer A Sharp
PMCID: PMC1323009  PMID: 16812609

Abstract

Pigeons were given a choice between two identical-duration situations (terminal links of chain schedules). One terminal link of the choice pair provided two food deliveries, and the other provided five. The exact times of these food deliveries differed between the terminal links and were varied over conditions. A single response during the initial link gave immediate access to the corresponding terminal link. Forced trials, during which only one of the initial-link keys was lighted, were interspersed with choice trials during which both initial-link keys were lighted. Choice tended to favor whichever terminal link was correlated with the higher sum of the immediacies (i.e., the sum of the reciprocals of the delays to each of the reinforcers following the choice, with all delays measured from the choice). Latencies on forced trials and on choice trials also were related (negatively) to the sum of the immediacies. This correlation among response measures (choice and latencies) suggests that both measures are manifestations of the effect of conditioned reinforcement on response tendencies.

Keywords: delay of reinforcement, conditioned reinforcement, choice, latency, preresponse pause, number of reinforcers, key peck, pigeons

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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