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N270 sensitivity to conflict strength and working memory: A combined ERP and sLORETA study

•We create an audiovisual conflict task with simultaneous target and distractor.•We assess the N270 sensitivity to the conflict strength and the working memory.•The conflict cost is higher for the auditory target than for the visual target.•The N270 is sensitive to the conflict strength and the load...

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Published in:Behavioural brain research 2016-01, Vol.297, p.231-240
Main Authors: Scannella, Sébastien, Pariente, Jérémie, De Boissezon, Xavier, Castel-Lacanal, Evelyne, Chauveau, Nicolas, Causse, Mickaël, Dehais, Frédéric, Pastor, Josette
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container_title Behavioural brain research
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creator Scannella, Sébastien
Pariente, Jérémie
De Boissezon, Xavier
Castel-Lacanal, Evelyne
Chauveau, Nicolas
Causse, Mickaël
Dehais, Frédéric
Pastor, Josette
description •We create an audiovisual conflict task with simultaneous target and distractor.•We assess the N270 sensitivity to the conflict strength and the working memory.•The conflict cost is higher for the auditory target than for the visual target.•The N270 is sensitive to the conflict strength and the load in working memory.•Conflict processing and working memory share common neural subtract. The event-related potential N270 component is known to be an electrophysiological marker of the supramodal conflict processing. However little is know about the factors that may modulate its amplitude. In particular, among all studies that have investigated the N270, little or no control of the conflict strength and of the load in working memory have been done leaving a lack in the understanding of this component. We designed a spatial audiovisual conflict task with simultaneous target and cross-modal distractor to evaluate the N270 sensitivity to the conflict strength (i.e., visual target with auditory distractor or auditory target with visual distractor) and the load in working memory (goal task maintenance with frequent change in the target modality). In a first session, participants had to focus on one modality for the target position to be considered (left-hand or right-hand) while the distractor could be at the same side (compatible) or at opposite side (incompatible). In a second session, we used the same set of stimuli as in the first session with an additional distinct auditory signal that clued the participants to frequently switch between the auditory and the visual targets. We found that (1) reaction times and N270 amplitudes for conflicting situations were larger within the auditory target condition compared to the visual one, (2) the increase in target maintenance effort led to equivalent increase of both reaction times and N270 amplitudes within all conditions and (3) the right dorsolateral prefrontal cortex current density was higher for both conflicting and active maintenance of the target situations. These results provide new evidence that the N270 component is an electrophysiological marker of the supramodal conflict processing that is sensitive to the conflict strength and that conflict processing and active maintenance of the task goal are two functions of a common executive attention system.
doi_str_mv 10.1016/j.bbr.2015.10.014
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The event-related potential N270 component is known to be an electrophysiological marker of the supramodal conflict processing. However little is know about the factors that may modulate its amplitude. In particular, among all studies that have investigated the N270, little or no control of the conflict strength and of the load in working memory have been done leaving a lack in the understanding of this component. We designed a spatial audiovisual conflict task with simultaneous target and cross-modal distractor to evaluate the N270 sensitivity to the conflict strength (i.e., visual target with auditory distractor or auditory target with visual distractor) and the load in working memory (goal task maintenance with frequent change in the target modality). In a first session, participants had to focus on one modality for the target position to be considered (left-hand or right-hand) while the distractor could be at the same side (compatible) or at opposite side (incompatible). In a second session, we used the same set of stimuli as in the first session with an additional distinct auditory signal that clued the participants to frequently switch between the auditory and the visual targets. We found that (1) reaction times and N270 amplitudes for conflicting situations were larger within the auditory target condition compared to the visual one, (2) the increase in target maintenance effort led to equivalent increase of both reaction times and N270 amplitudes within all conditions and (3) the right dorsolateral prefrontal cortex current density was higher for both conflicting and active maintenance of the target situations. 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The event-related potential N270 component is known to be an electrophysiological marker of the supramodal conflict processing. However little is know about the factors that may modulate its amplitude. In particular, among all studies that have investigated the N270, little or no control of the conflict strength and of the load in working memory have been done leaving a lack in the understanding of this component. We designed a spatial audiovisual conflict task with simultaneous target and cross-modal distractor to evaluate the N270 sensitivity to the conflict strength (i.e., visual target with auditory distractor or auditory target with visual distractor) and the load in working memory (goal task maintenance with frequent change in the target modality). In a first session, participants had to focus on one modality for the target position to be considered (left-hand or right-hand) while the distractor could be at the same side (compatible) or at opposite side (incompatible). 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The event-related potential N270 component is known to be an electrophysiological marker of the supramodal conflict processing. However little is know about the factors that may modulate its amplitude. In particular, among all studies that have investigated the N270, little or no control of the conflict strength and of the load in working memory have been done leaving a lack in the understanding of this component. We designed a spatial audiovisual conflict task with simultaneous target and cross-modal distractor to evaluate the N270 sensitivity to the conflict strength (i.e., visual target with auditory distractor or auditory target with visual distractor) and the load in working memory (goal task maintenance with frequent change in the target modality). In a first session, participants had to focus on one modality for the target position to be considered (left-hand or right-hand) while the distractor could be at the same side (compatible) or at opposite side (incompatible). In a second session, we used the same set of stimuli as in the first session with an additional distinct auditory signal that clued the participants to frequently switch between the auditory and the visual targets. We found that (1) reaction times and N270 amplitudes for conflicting situations were larger within the auditory target condition compared to the visual one, (2) the increase in target maintenance effort led to equivalent increase of both reaction times and N270 amplitudes within all conditions and (3) the right dorsolateral prefrontal cortex current density was higher for both conflicting and active maintenance of the target situations. 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identifier ISSN: 0166-4328
ispartof Behavioural brain research, 2016-01, Vol.297, p.231-240
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1872-7549
language eng
recordid cdi_hal_primary_oai_HAL_hal_01982173v1
source ScienceDirect Freedom Collection 2022-2024
subjects Acoustic Stimulation - methods
Auditory Perception - physiology
Brain - physiology
Brain Mapping
Cognitive science
Conflict (Psychology)
Cues
Dorsolateral prefrontal cortex
Electroencephalography
Evoked Potentials
Executive attention
Female
Humans
Male
Memory, Short-Term - physiology
Middle Aged
N270
Neuropsychological Tests
Neuroscience
Photic Stimulation - methods
Reaction Time
sLORETA
Software
Supramodal conflict processing
Visual Perception - physiology
Working memory
title N270 sensitivity to conflict strength and working memory: A combined ERP and sLORETA study
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