Perceptual and motor conflict in the Stroop effect: Event-related brain potential and electromyography studies

Abstract

Event Abstract Back to Event Perceptual and motor conflict in the Stroop effect: Event-related brain potential and electromyography studies Denes Szűcs1, 2*, F. Soltész1 and S. White1 1 University of Cambridge, United Kingdom 2 Hungarian Academy of Sciences, Hungary In a series of event-related brain potential (ERP) and electromyography (EMG) studies [Szűcs et al., 2007, Behav Brain Funct; Szűcs & Soltész, 2007 Neuropsychologia; Szűcs & Soltész, 2008, Brain Res; Szűcs, Soltész & White, submitted] we investigated the role of perceptual and motor conflict in the Stroop effect. We used the numerical Stroop paradigm where participants had to judge which of the two simultaneously presented numbers was larger physically or numerically. The physical-size comparison task is analogous to the classical color-word Stroop paradigm in that the irrelevant numerical meaning of numbers affects physical magnitude judgments. The lateralized readiness potential (LRP) was used to guide the separation of perceptual and motor conflict. In the first three studies, there were two major findings. First, between 150-250 ms we found early ERP markers of perceptual conflict. Second, at around 400 ms, after the onset of the LRP, we found late conflict-related ERP amplitude effects. We hypothesized that these late effects may be related to resolving motor response competition, or to slow, context-related stimulus-conflict detection. In a fourth study we used EMG electrodes placed on response hands to directly investigate the presence of motor conflict at the level of effectors in the Stroop paradigm. Incorrect response activation detected by EMG was temporally contingent with late ERP effects identified by our previous studies. Hence, we conclude that late ERP effects in the Stroop paradigm are at least partially related to motor response competition. Altogether our studies establish reliable ERP markers of perceptual and motor conflict in the Stroop effect. Conference: 10th International Conference on Cognitive Neuroscience, Bodrum, Turkey, 1 Sep - 5 Sep, 2008. Presentation Type: Poster Presentation Topic: Decision Making and Response Selection Citation: Szűcs D, Soltész F and White S (2008). Perceptual and motor conflict in the Stroop effect: Event-related brain potential and electromyography studies. Conference Abstract: 10th International Conference on Cognitive Neuroscience. doi: 10.3389/conf.neuro.09.2009.01.211 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 08 Dec 2008; Published Online: 08 Dec 2008. * Correspondence: Denes Szűcs, University of Cambridge, Cambridge, United Kingdom, ds377@cam.ac.uk Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Denes Szűcs F. Soltész S. White Google Denes Szűcs F. Soltész S. White Google Scholar Denes Szűcs F. Soltész S. White PubMed Denes Szűcs F. Soltész S. White Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.