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The effect of prefeeding on fixed-ratio pausing is jointly determined by past and upcoming reinforcer magnitudes.
MedLine Citation:
PMID:  20804830     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Pausing within multiple fixed-ratio schedules differing in reinforcer magnitude is jointly controlled by both past and upcoming conditions of reinforcement. Abrupt shifts from a just-received large reinforcer to a signaled upcoming small reinforcer (i.e., a negative incentive shift) produce marked disruptions in responding, as indexed by extended pausing. The purpose of this experiment was to determine if reducing the level of food deprivation via prefeeding enhanced these disruptive effects. Five Long Evans rats lever-pressed according to a fixed-ratio schedule. Half of the components ended in a relatively large reinforcer (three 45-mg food pellets) and half ended in a relatively small reinforcer (one pellet). Components alternated irregularly, yielding four transitions between reinforcers: small-small, small-large, large-small (the negative incentive shift), and large-large. During five, 1-session prefeeding probes, rats were given 12 g of food in their home cages 1h prior to the start of the session. Under steady-state conditions, negative incentive shifts engendered the longest pausing. Prefeeding produced large absolute and relative increases in pausing during negative incentive shifts, and small increases in pausing in the other transitions. The results are interpreted within a resistance to change framework.
Authors:
Chad M Galuska; Katherine A Yadon
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-09-08
Journal Detail:
Title:  Behavioural processes     Volume:  86     ISSN:  1872-8308     ISO Abbreviation:  Behav. Processes     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7703854     Medline TA:  Behav Processes     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  156-9     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier B.V. All rights reserved.
Affiliation:
Department of Psychology, College of Charleston, 57 Coming Street, Charleston, SC 29424, USA. galuskac@cofc.edu
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