Document Detail

Sensitivity, changeover responses, and choice in transition.
MedLine Citation:
PMID:  19615608     Owner:  NLM     Status:  MEDLINE    
Studies of choice in steady state have shown that sensitivity to reinforcement increases with increasing fixed-ratio changeover (FR CO) requirements. We assessed the generality of this finding with choice in transition. Food deliveries were programmed according to concurrent variable-interval (VI) schedules. Seven different VI pairs arranged ratios of food deliveries (left/right) of 27:1, 9:1, 3:1, 1:1, 1:3, 1:9, and 1:27 at a constant overall rate across components. Within sessions, all seven ratios were presented in random order. Each component lasted for 10 food deliveries; components were separated by 60-s blackouts. A changeover lever required 1, 2, 4, 8, 16, 32, and 64 responses to alternate between two main levers. Redeterminations to all FR COs, but 64 responses, were obtained in descending order. Choice adjusted rapidly to rapid changes in the reinforcer ratio, tracking the lever associated with the highest probability of reinforcer. Sensitivity to reinforcement increased with increasing FR CO, replicating the negatively accelerated function found in our earlier study. With successive reinforcers in components, however, sensitivity reached asymptote values sooner with the largest (8, 16, and 32 responses), than with the smallest (1, 2, and 4 responses), FR CO requirements.
Angel A Jiménez; Carlos F Aparicio
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Publication Detail:
Type:  Journal Article     Date:  2009-03-09
Journal Detail:
Title:  Behavioural processes     Volume:  82     ISSN:  1872-8308     ISO Abbreviation:  Behav. Processes     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-07-20     Completed Date:  2009-09-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7703854     Medline TA:  Behav Processes     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1-6     Citation Subset:  IM    
Universidad de Guadalajara, Centro Universitario de Arte, Arquitectura y Diseño (CUAAD), CUCS, Mexico.
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MeSH Terms
Choice Behavior*
Rats, Wistar
Reinforcement (Psychology)*
Reinforcement Schedule

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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