Document Detail

Conflicts during response selection affect response programming: reactions toward the source of stimulation.
MedLine Citation:
PMID:  19485694     Owner:  NLM     Status:  MEDLINE    
In the Simon effect, participants make a left or right keypress in response to a nonspatial attribute (e.g., color) that is presented on the left or right. Reaction times (RTs) increase when the response activated by the irrelevant stimulus location and the response retrieved by instruction are in conflict. The authors measured RTs and movement parameters (MPs) of pointing responses in a typical Simon task. Their results show that the trajectories veer toward the imperative stimulus. This bias decreased as RTs increased. The authors suggest that the time course of trajectory deviations reflects the resolution of the response conflict over time. Further, time pressure did not affect the size of the Simon effect in MPs or its time course, but strongly reduced the Simon effect in RTs. In contrast, response selection before the onset of a go signal on the left or right did not affect the Simon effect in RTs, but reduced the Simon effect in MPs and reversed the time course. The authors speculate about independent Simon effects associated with response selection and programming.
Simona Buetti; Dirk Kerzel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of experimental psychology. Human perception and performance     Volume:  35     ISSN:  0096-1523     ISO Abbreviation:  J Exp Psychol Hum Percept Perform     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-06-02     Completed Date:  2009-07-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502589     Medline TA:  J Exp Psychol Hum Percept Perform     Country:  United States    
Other Details:
Languages:  eng     Pagination:  816-34     Citation Subset:  IM    
Copyright Information:
(c) 2009 APA, all rights reserved.
Faculté de Psychologie et des Sciences de l'Education, Université de Genève, Genève, Switzerland.
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MeSH Terms
Choice Behavior*
Color Perception*
Discrimination Learning*
Functional Laterality*
Inhibition (Psychology)
Pattern Recognition, Visual*

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

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