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Plos One : Spatiotemporal Dynamics of High-gamma Activities During a 3-stimulus Visual Oddball Task, Volume 8

By Ward, M. Lawrence

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Book Id: WPLBN0003966969
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos One : Spatiotemporal Dynamics of High-gamma Activities During a 3-stimulus Visual Oddball Task, Volume 8  
Author: Ward, M. Lawrence
Volume: Volume 8
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary)
Historic
Publication Date:
Publisher: Plos

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Ward, M. L. (n.d.). Plos One : Spatiotemporal Dynamics of High-gamma Activities During a 3-stimulus Visual Oddball Task, Volume 8. Retrieved from http://www.ebooklibrary.org/


Description
Description : Although many studies have investigated the neural basis of top-down and bottom-up attention, it still requires refinement in both temporal and spatial terms. We used magnetoencephalography to investigate the spatiotemporal dynamics of highgamma (52–100 Hz) activities during top-down and bottom-up visual attentional processes, aiming to extend the findings from functional magnetic resonance imaging and event-related potential studies. Fourteen participants performed a 3- stimulus visual oddball task, in which both infrequent non-target and target stimuli were presented. We identified highgamma event-related synchronization in the left middle frontal gyrus, the left intraparietal sulcus, the left thalamus, and the visual areas in different time windows for the target and non-target conditions. We also found elevated imaginary coherence between the left intraparietal sulcus and the right middle frontal gyrus in the high-gamma band from 300 to 400 ms in the target condition, and between the left thalamus and the left middle frontal gyrus in theta band from 150 to 450 ms. In addition, the strength of high-gamma imaginary coherence between the left middle frontal gyrus and left intraparietal sulcus, between the left middle frontal gyrus and the right middle frontal gyrus, and the high-gamma power in the left thalamus predicted inter-subject variation in target detection response time. This source-level electrophysiological evidence enriches our understanding of bi-directional attention processes : stimulus-driven bottom-up attention orientation to a salient, but irrelevant stimulus: and top-down allocation of attentional resources to stimulus evaluation.

 

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