Document Detail

Dynamics of choice and frequency of environment change.
MedLine Citation:
PMID:  18406077     Owner:  NLM     Status:  MEDLINE    
Recent research has examined the effects on behavioral adjustment of a range of within-session changes in the reinforcer ratio available from two alternatives. Regularities between extended patterns of behavior (choice) and a distribution of food deliveries (expressed as a food-rate ratio) have emerged from such studies. To assess the generality of these findings, the present study manipulated rats' experience in the choice situation. Sixteen rats were divided into two groups of eight rats each. Seven non-signaled food-rate ratios were arranged to occur for responses on two concurrently available levers. Group 1 experienced a different food-rate ratio every day; each ratio provided 70 food deliveries, and none of the seven ratios operated for 2 consecutive days. Group 2 experienced the same sequence of food-rate ratios, except that each food-rate ratio remained in effect for 17 consecutive days (providing 70 food deliveries per session), after which a different food-rate ratio was selected for the next 17 sessions. In all cases, preference was adjusted to changes in food-rate ratios. Estimates of sensitivity to changes in food-rate ratios increased with an increasing number of sessions (i.e., experience in the choice situation).
Carlos F Aparicio
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2008-03-14
Journal Detail:
Title:  Behavioural processes     Volume:  78     ISSN:  0376-6357     ISO Abbreviation:  Behav. Processes     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-04-28     Completed Date:  2008-07-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7703854     Medline TA:  Behav Processes     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  165-72     Citation Subset:  IM    
University of Guadalajara-CUCS-Neuroscience, Sierra Mojada 950, Peatonal 3, Edif. N, 1er. piso, Guadalajara, Jalisco 44340, Mexico.
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MeSH Terms
Adaptation, Psychological*
Choice Behavior*
Conditioning, Operant
Generalization (Psychology)*
Rats, Wistar
Reinforcement (Psychology)*
Reinforcement Schedule
Set (Psychology)*
Time Factors

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

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