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

Autor: Jérémie Pariente, Josette Pastor, Mickaël Causse, Evelyne Castel-Lacanal, Xavier de Boissezon, Sébastien Scannella, Nicolas Chauveau, Frédéric Dehais
Přispěvatelé: Institut National de la Santé et de la Recherche Médicale - INSERM (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Auditory perception
Male
Visual perception
genetic structures
sLORETA
Neuropsychological Tests
Brain mapping
050105 experimental psychology
Task (project management)
Executive attention
Conflict
Psychological
03 medical and health sciences
Behavioral Neuroscience
0302 clinical medicine
medicine
Reaction Time
Humans
0501 psychology and cognitive sciences
Set (psychology)
Evoked Potentials
Brain Mapping
Modality (human–computer interaction)
Working memory
05 social sciences
Neurosciences
Brain
Electroencephalography
Middle Aged
Dorsolateral prefrontal cortex
N270
medicine.anatomical_structure
Memory
Short-Term
Acoustic Stimulation
Auditory Perception
Visual Perception
Female
Cues
Psychology
Supramodal conflict processing
030217 neurology & neurosurgery
Photic Stimulation
Software
Cognitive psychology
Zdroj: Behavioural Brain Research.
ISSN: 0166-4328
Popis: 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.
Databáze: OpenAIRE
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