Document Detail

Central and parietal event-related lateralizations in a flanker task.
MedLine Citation:
PMID:  15318882     Owner:  NLM     Status:  MEDLINE    
Recently Wascher et al. (1999) reported that in a flanker task with arrow stimuli not only the known lateralized readiness potential (LRP) that reflects lateralized response activation was induced, but also a parietal lateralized activation (direction encoding lateralization; DEL) that was interpreted as reflecting an earlier coding of a response side. However, the Wascher study did not exclude that the DEL could have also been due to lateralized stimulus- or attention-related factors. In the present study we used vertically directed arrow stimuli, and had our subjects perform responses in the vertical dimension. To separate flanker-induced from target-induced lateralizations the delay between the presentations of irrelevant and relevant stimuli (stimulus onset asynchrony; SOA) was manipulated. Apart from the usual LRPs we obtained clear DELs that varied in a similar way with the experimental variables, but peaked earlier and had a more posterior topography than the LRP. These results indicate that the DEL reflects premotor response representation.
Rita Willemssen; Jöorg Hoormann; Joachim Hohnsbein; Michael Falkenstein
Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Psychophysiology     Volume:  41     ISSN:  0048-5772     ISO Abbreviation:  Psychophysiology     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-08-20     Completed Date:  2004-11-09     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0142657     Medline TA:  Psychophysiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  762-71     Citation Subset:  IM    
Leibniz Research Center for Working Environment and Human Factors, Dortmund, Germany.
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MeSH Terms
Attention / physiology
Central Nervous System / physiology*
Form Perception / physiology
Functional Laterality / physiology
Parietal Lobe / physiology*
Photic Stimulation
Psychomotor Performance / physiology*

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