Reward value effects on timing in the peak procedure

Tiffany Galtress; Kimberly Kirkpatrick

doi:10.1016/j.lmot.2008.05.004

Reward value effects on timing in the peak procedure

Tiffany Galtress
, Kimberly Kirkpatrick

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

Three experiments examined the effect of motivational variables on timing in the peak procedure. In Experiment 1, rats received a 60-s peak procedure that was coupled with long-term, between-phase changes in reinforcer magnitude. Increases in reinforcer magnitude produced a leftward shift in the peak that persisted for 20 sessions of training. In a final phase, the rats received lithium chloride-induced aversion prior to testing and a rightward shift in the peak was observed. Experiment 2 confirmed the rightward shift in the peak under lithium chloride devaluation and induced a comparable shift with satiety devaluation. The degree of rightward shift was neither additive nor multiplicative, suggesting that two processes may have contributed. Experiment 3 examined the effect of extinction on peak responding, revealing a decrease in response rate, but no evidence of any change in the timing of responding. The implications of the results for contemporary timing theories are discussed.

Original language	English (US)
Pages (from-to)	109-131
Number of pages	23
Journal	Learning and Motivation
Volume	40
Issue number	2
DOIs	https://doi.org/10.1016/j.lmot.2008.05.004
State	Published - May 2009
Externally published	Yes

Bibliographical note

Funding Information:
This research was supported by a grant from the Biotechnology and Biological Sciences Research Foundation (BB/E008224/1). The authors thank Richard Wood and Stuart Morley for technical support and animal care. The results presented in this article formed part of a Ph.D. dissertation completed by Tiffany Galtress and an undergraduate project completed by Ruth Harrison and Lyndsay Haynes. The research contained within this article was conducted in accordance with the provisions of the Animals (Scientific Procedures) Act 1986, United Kingdom.

Keywords

Fixed interval
Peak procedure
Rats
Reinforcer devaluation
Reinforcer magnitude
Time perception
Timing

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10.1016/j.lmot.2008.05.004

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title = "Reward value effects on timing in the peak procedure",

abstract = "Three experiments examined the effect of motivational variables on timing in the peak procedure. In Experiment 1, rats received a 60-s peak procedure that was coupled with long-term, between-phase changes in reinforcer magnitude. Increases in reinforcer magnitude produced a leftward shift in the peak that persisted for 20 sessions of training. In a final phase, the rats received lithium chloride-induced aversion prior to testing and a rightward shift in the peak was observed. Experiment 2 confirmed the rightward shift in the peak under lithium chloride devaluation and induced a comparable shift with satiety devaluation. The degree of rightward shift was neither additive nor multiplicative, suggesting that two processes may have contributed. Experiment 3 examined the effect of extinction on peak responding, revealing a decrease in response rate, but no evidence of any change in the timing of responding. The implications of the results for contemporary timing theories are discussed.",

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author = "Tiffany Galtress and Kimberly Kirkpatrick",

note = "Funding Information: This research was supported by a grant from the Biotechnology and Biological Sciences Research Foundation (BB/E008224/1). The authors thank Richard Wood and Stuart Morley for technical support and animal care. The results presented in this article formed part of a Ph.D. dissertation completed by Tiffany Galtress and an undergraduate project completed by Ruth Harrison and Lyndsay Haynes. The research contained within this article was conducted in accordance with the provisions of the Animals (Scientific Procedures) Act 1986, United Kingdom.",

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N2 - Three experiments examined the effect of motivational variables on timing in the peak procedure. In Experiment 1, rats received a 60-s peak procedure that was coupled with long-term, between-phase changes in reinforcer magnitude. Increases in reinforcer magnitude produced a leftward shift in the peak that persisted for 20 sessions of training. In a final phase, the rats received lithium chloride-induced aversion prior to testing and a rightward shift in the peak was observed. Experiment 2 confirmed the rightward shift in the peak under lithium chloride devaluation and induced a comparable shift with satiety devaluation. The degree of rightward shift was neither additive nor multiplicative, suggesting that two processes may have contributed. Experiment 3 examined the effect of extinction on peak responding, revealing a decrease in response rate, but no evidence of any change in the timing of responding. The implications of the results for contemporary timing theories are discussed.

AB - Three experiments examined the effect of motivational variables on timing in the peak procedure. In Experiment 1, rats received a 60-s peak procedure that was coupled with long-term, between-phase changes in reinforcer magnitude. Increases in reinforcer magnitude produced a leftward shift in the peak that persisted for 20 sessions of training. In a final phase, the rats received lithium chloride-induced aversion prior to testing and a rightward shift in the peak was observed. Experiment 2 confirmed the rightward shift in the peak under lithium chloride devaluation and induced a comparable shift with satiety devaluation. The degree of rightward shift was neither additive nor multiplicative, suggesting that two processes may have contributed. Experiment 3 examined the effect of extinction on peak responding, revealing a decrease in response rate, but no evidence of any change in the timing of responding. The implications of the results for contemporary timing theories are discussed.

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KW - Peak procedure

KW - Rats

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KW - Reinforcer magnitude

KW - Time perception

KW - Timing

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Reward value effects on timing in the peak procedure

Abstract

Bibliographical note

Keywords

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