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@article{1298006,
author = {Labounek, René and Lamoš, Martin and Mareček, Radek and Brázdil, Milan and Jan, Jiří},
article_location = {Amsterdam},
article_number = {April},
doi = {http://dx.doi.org/10.1016/j.jneumeth.2015.02.016},
keywords = {Simultaneous EEG-fMRI; Visual oddball paradigm; Absolute and relative power; Regressor; General linear model (GLM); Task-related variability; EEG Regressor Builder},
language = {eng},
issn = {0165-0270},
journal = {Journal of Neuroscience Methods},
title = {Exploring task-related variability in fMRI data using fluctuations in power spectrum of simultaneously acquired EEG},
url = {http://ac.els-cdn.com/S0165027015000680/1-s2.0-S0165027015000680-main.pdf?_tid=76e7f970-e4e9-11e4-9b06-00000aacb35d&acdnat=1429265390_adfde5114725ad4989c367531769990a},
volume = {245},
year = {2015}
}
TY - JOUR
ID - 1298006
AU - Labounek, René - Lamoš, Martin - Mareček, Radek - Brázdil, Milan - Jan, Jiří
PY - 2015
TI - Exploring task-related variability in fMRI data using fluctuations in power spectrum of simultaneously acquired EEG
JF - Journal of Neuroscience Methods
VL - 245
IS - April
SP - 125-136
EP - 125-136
PB - Elsevier Science Ltd
SN - 01650270
KW - Simultaneous EEG-fMRI
KW - Visual oddball paradigm
KW - Absolute and relative power
KW - Regressor
KW - General linear model (GLM)
KW - Task-related variability
KW - EEG Regressor Builder
UR - http://ac.els-cdn.com/S0165027015000680/1-s2.0-S0165027015000680-main.pdf?_tid=76e7f970-e4e9-11e4-9b06-00000aacb35d&acdnat=1429265390_adfde5114725ad4989c367531769990a
L2 - http://ac.els-cdn.com/S0165027015000680/1-s2.0-S0165027015000680-main.pdf?_tid=76e7f970-e4e9-11e4-9b06-00000aacb35d&acdnat=1429265390_adfde5114725ad4989c367531769990a
N2 - Background: The paper deals with joint analysis of fMRI and scalp EEG data, simultaneously acquired during event-related oddball experiment. The analysis is based on deriving temporal sequences of EEG powers in individual frequency bands for the selected EEG electrodes and using them as regressors in the general linear model (GLM). New method: Given the infrequent use of EEG spectral changes to explore task-related variability, we focused on the aspects of parameter setting during EEG regressor calculation and searched for such parameters that can detect task-related variability in EEG-fMRI data. We proposed a novel method that uses relative EEG power in GLM. Results: Parameter, the type of power value, has a direct impact as to whether task-related variability is detected or not. For relative power, the final results are sensitive to the choice of frequency band of interest. The electrode selection also has certain impact; however, the impact is not crucial. It is insensitive to the choice of EEG power series temporal weighting step. Relative EEG power characterizes the experimental task activity better than the absolute power. Absolute EEG power contains broad spectrum component. Task-related relative power spectral formulas were derived. Comparison with existing methods: For particular set of parameters, our results are consistent with previously published papers. Our work expands current knowledge by new findings in spectral patterns of different brain processes related to the experimental task. Conclusions: To make analysis to be sensitive to task-related variability, the parameters type of power value and frequency band should be set properly. © 2015 Elsevier B.V.
ER -
LABOUNEK, René, Martin LAMOŠ, Radek MAREČEK, Milan BRÁZDIL a Jiří JAN. Exploring task-related variability in fMRI data using fluctuations in power spectrum of simultaneously acquired EEG. \textit{Journal of Neuroscience Methods}. Amsterdam: Elsevier Science Ltd, roč.~245, April, s.~125-136. ISSN~0165-0270. doi:10.1016/j.jneumeth.2015.02.016. 2015.
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