Event-related brain oscillations associated with color-word interference

Abstract

Event Abstract Back to Event Event-related brain oscillations associated with color-word interference Mehmet Ergen1*, S. Saban2, E. Kirmizi-Alsan1, Zübeyir Bayraktaroglu1, A. Uslu1, H. Gürvit1 and T. Demiralp1 1 Istanbul University, Turkey 2 Yeditepe University, Turkey Stroop color-word test requires subjects to read (semantic processing) a color word printed in a different ink color. The interference between word meaning and ink color slows down the reactions to incongruent stimuli. EEG was recorded from 23 subjects during a computerized version of Stroop test. The longer reaction time for incongruent condition was replicated. N4 potential was found to be more negative for incongruent condition, which is also in line with the previous findings. The wavelet transforms of the averaged ERP and the single trials were computed to investigate the amplitudes of the evoked (phase-locked) and total (phase-locked + non-phase-locked) oscillatory responses. Evoked delta (250-600 ms) was larger in response to congruent trial (p<0.01), which can be interpreted as somewhat coherent with our earlier studies on oddball experiments. Since the delta response has been related with stimulus evaluation and decision making, a larger delta response for congruent condition which involves a relatively simpler decision process was predicted. The total theta activity (300-700 ms) was significantly increased incongruent trials (p=0.05), and this effect was more prominent over fronto-central region (p<0.05). The late timing and frontal scalp distribution of theta suggest that it could be related to resolution of the conflict in response production stage, due to color-word interference. The evoked alpha response (100-200 ms) in incongruent trials was higher with trend level significance, and this finding leads to the reconsideration of the assumption based on the time-domain analyses that the processes dealing with the color-word interference start around 450 ms. Finally, the results on time-frequency plane, allowed further characterization of the cognitive processes during resolution of Stroop interference. Conference: 10th International Conference on Cognitive Neuroscience, Bodrum, Turkey, 1 Sep - 5 Sep, 2008. Presentation Type: Oral Presentation Topic: Decision Making and Response Selection Citation: Ergen M, Saban S, Kirmizi-Alsan E, Bayraktaroglu Z, Uslu A, Gürvit H and Demiralp T (2008). Event-related brain oscillations associated with color-word interference. Conference Abstract: 10th International Conference on Cognitive Neuroscience. doi: 10.3389/conf.neuro.09.2009.01.181 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: Mehmet Ergen, Istanbul University, Istanbul, Turkey, mehmet.ergen@gmail.com 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 Mehmet Ergen S. Saban E. Kirmizi-Alsan Zübeyir Bayraktaroglu A. Uslu H. Gürvit T. Demiralp Google Mehmet Ergen S. Saban E. Kirmizi-Alsan Zübeyir Bayraktaroglu A. Uslu H. Gürvit T. Demiralp Google Scholar Mehmet Ergen S. Saban E. Kirmizi-Alsan Zübeyir Bayraktaroglu A. Uslu H. Gürvit T. Demiralp PubMed Mehmet Ergen S. Saban E. Kirmizi-Alsan Zübeyir Bayraktaroglu A. Uslu H. Gürvit T. Demiralp 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.