Document Detail

The effects of the previous outcome on probabilistic choice in rats.
MedLine Citation:
PMID:  23205915     Owner:  NLM     Status:  MEDLINE    
This study examined the effects of previous outcomes on subsequent choices in a probabilistic-choice task. Twenty-four rats were trained to choose between a certain outcome (1 or 3 pellets) versus an uncertain outcome (3 or 9 pellets), delivered with a probability of .1, .33, .67, and .9 in different phases. Uncertain outcome choices increased with the probability of uncertain food. Additionally, uncertain choices increased with the probability of uncertain food following both certain-choice outcomes and unrewarded uncertain choices. However, following uncertain-choice food outcomes, there was a tendency to choose the uncertain outcome in all cases, indicating that the rats continued to "gamble" after successful uncertain choices, regardless of the overall probability or magnitude of food. A subsequent manipulation, in which the probability of uncertain food varied within each session as a function of the previous uncertain outcome, examined how the previous outcome and probability of uncertain food affected choice in a dynamic environment. Uncertain-choice behavior increased with the probability of uncertain food. The rats exhibited increased sensitivity to probability changes and a greater degree of win-stay/lose-shift behavior than in the static phase. Simulations of two sequential choice models were performed to explore the possible mechanisms of reward value computations. The simulation results supported an exponentially decaying value function that updated as a function of trial (rather than time). These results emphasize the importance of analyzing global and local factors in choice behavior and suggest avenues for the future development of sequential-choice models.
Andrew T Marshall; Kimberly Kirkpatrick
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Publication Detail:
Type:  Journal Article     Date:  2012-12-03
Journal Detail:
Title:  Journal of experimental psychology. Animal behavior processes     Volume:  39     ISSN:  1939-2184     ISO Abbreviation:  J Exp Psychol Anim Behav Process     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-15     Completed Date:  2013-06-25     Revised Date:  2014-02-03    
Medline Journal Info:
Nlm Unique ID:  7504289     Medline TA:  J Exp Psychol Anim Behav Process     Country:  United States    
Other Details:
Languages:  eng     Pagination:  24-38     Citation Subset:  IM    
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MeSH Terms
Acoustic Stimulation
Analysis of Variance
Choice Behavior / physiology*
Conditioning, Operant / physiology*
Probability Learning*
Rats, Sprague-Dawley
Reinforcement (Psychology)
Reinforcement Schedule
Grant Support

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