Document Detail

Reaction time signatures of discriminative processes: differential effects of stimulus similarity and incentive.
MedLine Citation:
PMID:  15281388     Owner:  NLM     Status:  MEDLINE    
In three experiments with pigeons, the similarity of unreinforced test stimuli to a reinforced stimulus and the frequency of reinforcement associated with a stimulus were varied. The stimulus on each trial was a small spot that appeared in different hues or, in Experiment 3, different forms. Differential response frequency and reaction time (RT) patterns emerged: Changes in similarity affected the percentage of stimuli responded to but left the shape of RT distributions about the same, whereas changes in reinforcement shifted RT distributions but had little effect on the percentage of responses. When the similarity and reinforcement variables were applied to the same stimuli (Experiment 2), their effects were largely independent. A generalization procedure (Experiment 3) replicated the similarity effects of the initial discrimination procedure. The RT distributions were modeled by a diffusion process, and implications for a memory-instance model were suggested.
Donald S Blough
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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:  157-72     Citation Subset:  IM    
Department of Psychology, Brown University, Providence, Rhode Island 02912, USA.
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MeSH Terms
Choice Behavior*
Color Perception
Decision Making
Discrimination Learning*
Models, Psychological
Pattern Recognition, Visual*
Psychological Theory
Reaction Time
Reinforcement (Psychology)*
Grant Support

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