Post-stimulus endogenous and exogenous oscillations are differentially modulated by task difficulty

We investigate the modulation of post-stimulus endogenous and exogenous oscillations when a visual discrimination is made more difficult. We use exogenous frequency tagging to induce steady-state visually evoked potentials (SSVEP) while subjects perform a face-car discrimination task, the difficulty...

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Main Authors:	Li, Yun, Lou, Bin, Gao, Xiaorong, Sajda, Paul
Format:	Online
Language:	English
Published:	Frontiers Media S.A. 2013
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3560344/

id	pubmed-3560344
recordtype	oai_dc
spelling	pubmed-35603442013-02-05 Post-stimulus endogenous and exogenous oscillations are differentially modulated by task difficulty Li, Yun Lou, Bin Gao, Xiaorong Sajda, Paul Neuroscience We investigate the modulation of post-stimulus endogenous and exogenous oscillations when a visual discrimination is made more difficult. We use exogenous frequency tagging to induce steady-state visually evoked potentials (SSVEP) while subjects perform a face-car discrimination task, the difficulty of which varies on a trial-to-trial basis by varying the noise (phase coherence) in the image. We simultaneously analyze amplitude modulations of the SSVEP and endogenous alpha activity as a function of task difficulty. SSVEP modulation can be viewed as a neural marker of attention toward/away from the primary task, while modulation of post-stimulus alpha is closely related to cortical information processing. We find that as the task becomes more difficult, the amplitude of SSVEP decreases significantly, approximately 250–450 ms post-stimulus. Significant changes in endogenous alpha amplitude follow SSVEP modulation, occurring at approximately 400–700 ms post-stimulus and, unlike the SSVEP, the alpha amplitude is increasingly suppressed as the task becomes less difficult. Our results demonstrate simultaneous measurement of endogenous and exogenous oscillations that are modulated by task difficulty, and that the specific timing of these modulations likely reflects underlying information processing flow during perceptual decision-making. Frontiers Media S.A. 2013-01-31 /pmc/articles/PMC3560344/ /pubmed/23386819 http://dx.doi.org/10.3389/fnhum.2013.00009 Text en Copyright © 2013 Li, Lou, Gao and Sajda. http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Li, Yun Lou, Bin Gao, Xiaorong Sajda, Paul
spellingShingle	Li, Yun Lou, Bin Gao, Xiaorong Sajda, Paul Post-stimulus endogenous and exogenous oscillations are differentially modulated by task difficulty
author_facet	Li, Yun Lou, Bin Gao, Xiaorong Sajda, Paul
author_sort	Li, Yun
title	Post-stimulus endogenous and exogenous oscillations are differentially modulated by task difficulty
title_short	Post-stimulus endogenous and exogenous oscillations are differentially modulated by task difficulty
title_full	Post-stimulus endogenous and exogenous oscillations are differentially modulated by task difficulty
title_fullStr	Post-stimulus endogenous and exogenous oscillations are differentially modulated by task difficulty
title_full_unstemmed	Post-stimulus endogenous and exogenous oscillations are differentially modulated by task difficulty
title_sort	post-stimulus endogenous and exogenous oscillations are differentially modulated by task difficulty
description	We investigate the modulation of post-stimulus endogenous and exogenous oscillations when a visual discrimination is made more difficult. We use exogenous frequency tagging to induce steady-state visually evoked potentials (SSVEP) while subjects perform a face-car discrimination task, the difficulty of which varies on a trial-to-trial basis by varying the noise (phase coherence) in the image. We simultaneously analyze amplitude modulations of the SSVEP and endogenous alpha activity as a function of task difficulty. SSVEP modulation can be viewed as a neural marker of attention toward/away from the primary task, while modulation of post-stimulus alpha is closely related to cortical information processing. We find that as the task becomes more difficult, the amplitude of SSVEP decreases significantly, approximately 250–450 ms post-stimulus. Significant changes in endogenous alpha amplitude follow SSVEP modulation, occurring at approximately 400–700 ms post-stimulus and, unlike the SSVEP, the alpha amplitude is increasingly suppressed as the task becomes less difficult. Our results demonstrate simultaneous measurement of endogenous and exogenous oscillations that are modulated by task difficulty, and that the specific timing of these modulations likely reflects underlying information processing flow during perceptual decision-making.
publisher	Frontiers Media S.A.
publishDate	2013
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3560344/
_version_	1611951392435470336

Post-stimulus endogenous and exogenous oscillations are differentially modulated by task difficulty

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