Document Detail

Effects of stimulus probability on pupillary dilation and reaction time in categorization.
MedLine Citation:
PMID:  17371494     Owner:  NLM     Status:  MEDLINE    
Stimuli presented with a low frequency elicit larger pupillary responses than those presented with a high frequency. Similar effects are known for motor responses observed in reaction time experiments. Utilizing this stimulus probability effect, we conducted a Go/NoGo reaction time experiment and measured pupillary dilation to evaluate categorization. We found no probability effect when participants used distinctive features to classify stimuli with different frequencies into the same category. If no distinctive features could be applied, however, the effect was observed in both pupillary and reaction time data. The stimulus probability effect can serve as a tool for the evaluation of categorization and is discussed in the context of orienting.
Günter Reinhard; Harald Lachnit; Stephan König
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-03-19
Journal Detail:
Title:  Psychophysiology     Volume:  44     ISSN:  0048-5772     ISO Abbreviation:  Psychophysiology     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-04-16     Completed Date:  2007-07-16     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0142657     Medline TA:  Psychophysiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  469-75     Citation Subset:  IM    
Faculty of Psychology, Philipps-Universität Marburg, Gutenbergstrasse 18, D-35032 Marburg, Germany.
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MeSH Terms
Feedback, Psychological
Inhibition (Psychology)
Pattern Recognition, Visual*
Probability Learning*
Reaction Time*
Reflex, Pupillary*
Set (Psychology)

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