Document Detail

Effects of reinforcement magnitude and ratio values on behaviour maintained by a cyclic ratio schedule of reinforcement.
MedLine Citation:
PMID:  11131787     Owner:  NLM     Status:  MEDLINE    
In Experiments 1 and 2, lever pressing by rats was reinforced on a cyclic ratio schedule of food reinforcement, comprising a repeated sequence of fixed-ratio component schedules. Reinforcement magnitude was varied, on occasional sessions in Experiment 1 and across blocks of sessions in Experiment 2, from one to two or three 45-mg food pellets. In the one-pellet condition, post-reinforcement pauses increased with component schedule value. At higher magnitudes, post-reinforcement pauses increased, and overall response rates declined. Response rate on component schedules was a decreasing linear function of the obtained rate of reinforcement in all conditions. Plotted against component schedule value, response rate increased exponentially to an asymptote that decreased when reinforcement magnitude increased. These findings are consistent with regulatory accounts of food-reinforced behaviour. In Experiment 3, rats were trained under a cyclic ratio schedule comprising fixed-ratio components including higher values, and some inverted U-shaped response functions were obtained. Those rats that did not show this relationship were trained on cyclic ratios with even higher values, and all showed inverted U-shaped response functions. This suggests that behaviour on cyclic ratio schedules can reflect activating of reinforcement as well as the satiating effects seen in Experiments 1 and 2.
J C Leslie; C Boyle; D Shaw
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Quarterly journal of experimental psychology. B, Comparative and physiological psychology     Volume:  53     ISSN:  0272-4995     ISO Abbreviation:  Q J Exp Psychol B     Publication Date:  2000 Nov 
Date Detail:
Created Date:  2000-12-22     Completed Date:  2001-02-15     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  8107270     Medline TA:  Q J Exp Psychol B     Country:  England    
Other Details:
Languages:  eng     Pagination:  289-308     Citation Subset:  IM    
School of Psychology, University of Ulster at Jordanstown, Newtownabbey, U.K.
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MeSH Terms
Appetitive Behavior
Conditioning, Operant*
Rats, Sprague-Dawley
Reinforcement Schedule*

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