Document Detail

Delay discounting of qualitatively different reinforcers in rats.
MedLine Citation:
PMID:  20885809     Owner:  NLM     Status:  MEDLINE    
Humans discount larger delayed rewards less steeply than smaller rewards, whereas no such magnitude effect has been observed in rats (and pigeons). It remains possible that rats' discounting is sensitive to differences in the quality of the delayed reinforcer even though it is not sensitive to amount. To evaluate this possibility, Experiment 1 examined discounting of qualitatively different food reinforcers: highly preferred versus nonpreferred food pellets. Similarly, Experiment 2 examined discounting of highly preferred versus nonpreferred liquid reinforcers. In both experiments, an adjusting-amount procedure was used to determine the amount of immediate reinforcer that was judged to be of equal subjective value to the delayed reinforcer. The amount and quality of the delayed reinforcer were varied across conditions. Discounting was well described by a hyperbolic function, but no systematic effects of the quantity or the quality of the delayed reinforcer were observed.
Amanda L Calvert; Leonard Green; Joel Myerson
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the experimental analysis of behavior     Volume:  93     ISSN:  1938-3711     ISO Abbreviation:  J Exp Anal Behav     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-10-04     Completed Date:  2011-02-08     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  0203727     Medline TA:  J Exp Anal Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  171-84     Citation Subset:  IM    
Washington University, Department of Psychology, Campus Box1125, Saint Louis, MO 63130, USA.
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MeSH Terms
Choice Behavior*
Food Preferences / psychology*
Models, Psychological
Neuropsychological Tests
Rats, Sprague-Dawley
Reinforcement Schedule*
Grant Support

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