Document Detail

The relation of multiple-schedule behavioral contrast to deprivation, time in session, and within-session changes in responding.
MedLine Citation:
PMID:  15281391     Owner:  NLM     Status:  MEDLINE    
Pigeons' keypecking was reinforced by food on baseline schedules of multiple variable interval (VI) x VI x and on contrast schedules of multiple VI x VI y. Deprivation of food was varied by maintaining subjects at 75%, 85%, and 95% (+/- 2%) of their free-feeding weights. Positive and negative behavioral contrast were observed. The size of the contrast was not systematically altered by changes in deprivation. Positive and negative contrast were both larger later in the session than they were earlier. Within-session decreases in responding were steeper for the baseline than for the contrast schedules for positive contrast. Within-session decreases were steeper for the contrast than for the baseline schedules for negative contrast. These results were predicted by the idea that different amounts of habituation to the reinforcer during the baseline and contrast schedules contribute to behavioral contrast. The results show that contrast occurs under conditions that reduce the effect of the following component. The results support the assumption that positive and negative contrast are produced by symmetrical theoretical variables.
Frances K McSweeney; Samantha Swindell; Eric S Murphy; Benjamin P Kowal
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Learning & behavior     Volume:  32     ISSN:  1543-4494     ISO Abbreviation:  Learn Behav     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-07-29     Completed Date:  2004-08-24     Revised Date:  2011-01-24    
Medline Journal Info:
Nlm Unique ID:  101155056     Medline TA:  Learn Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  190-201     Citation Subset:  IM    
Department of Psychology, Washington State University, Pullman, Washington 99164-4820, USA.
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MeSH Terms
Conditioning, Operant*
Food Deprivation*
Habituation, Psychophysiologic*
Random Allocation
Reinforcement (Psychology)*
Reinforcement Schedule*
Grant Support

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