Electrophysiological measures of conflict detection and resolution in the Stroop task

Coderre, Emily L. and Conklin, Kathy and van Heuven, Walter J.B. (2011) Electrophysiological measures of conflict detection and resolution in the Stroop task. Brain Research, 1413 . pp. 51-59. ISSN 0006-8993

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Conflict detection and resolution is crucial in a cognitive task like the Stroop task. Previous studies have identified an early negativity component (Ninc) as a prominent marker of Stroop conflict in event-related potentials (ERPs). However, to what extent this ERP component reflects conflict detection and/or resolution is still unclear. Here, we report a Stroop task in which the stimulus onset asynchrony (SOA) of color and word stimuli presentation was manipulated in order to disentangle the roles of conflict detection and conflict resolution in generating Stroop-related ERP components. Separating the word from the color information gives us precise control over the timing of conflict. If the Ninc is related with conflict resolution it should be absent when the word appears during response preparation, as in a long-latency positive SOA. Our data shows that the Ninc occurs in all SOAs, even after a response has been made, supporting its role in the detection of stimulus conflict rather than conflict resolution. The use of SOA manipulation therefore allows for the examination of a wider temporal spectrum of interference in order to specify the functions of this conflict-related component. These results provide insight into the neural

signatures of conflict processes, and have implications for models of cognitive control mechanisms in the brain.

Item Type: Article
Keywords: Stroop, Electroencephalography (EEG), Cognitive control Conflict detection, Stimulus onset asynchrony (SOA), Manipulation
Schools/Departments: University of Nottingham UK Campus > Faculty of Arts > School of English
Identification Number: https://doi.org/10.1016/j.brainres.2011.07.017
Depositing User: Conklin, Dr. Kathy
Date Deposited: 15 Mar 2015 22:36
Last Modified: 16 Sep 2016 23:27
URI: http://eprints.nottingham.ac.uk/id/eprint/28431

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