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| Research article summary (published 7 May 2003): |
Delayed flanker effects on lateralized readiness potentials.
Full Abstract
When participants were required to respond to a relevant central target and ignore irrelevant flanking stimuli, the flankers produced a response compatibility effect. Electrophysiological studies have shown that irrelevant flanker stimuli can affect the motor system. The present experiments further examined the characteristics of flanker effects on the motor system. Sixty participants responded in the flanker task to arrows (experiment 1) or letters (experiment 2). To examine time and extent of flanker effects on the motor system, target onset was delayed with blocked or random stimulus-onset asynchronies (SOA). With SOA of 0 and 100 ms, flanker effects on behavioral measures were reduced in random as compared to blocked conditions, but enhanced with SOA of 400 ms. With SOA of 400 ms, flanker effects on the early lateralized readiness potentials (LRP) were reduced in blocked as compared to random conditions, indicating that the onset of flanker effects on the LRP was delayed. Response-locked LRPs suggest that flanker and target stimuli activate the motor system successively. Findings challenge current theories of the flanker compatibility effect.
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Author information
Author/s: Mattler, Uwe (U);
Affiliation: Fakultät für Naturwissenschaften, Institut für Psychologie II, Otto-von-Guericke Universität Magdeburg, Postfach 4120, 39016, Magdeburg, Germany. uwe.mattler(-atsign-)nat.uni-magdeburg.de
Journal and publication information
Publication Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't
Journal: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale (Exp Brain Res), published in Germany. (Language: eng)
Reference: 2003-Jul; vol 151 (issue 2) : pp 272-88
Dates: Created 2003/09/25; Completed 2003/10/21; Revised 2008/02/15;
PMID: 12739092, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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