About: Functional connectivity in resting-state fMRI: Is linear correlation sufficient?

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Functional connectivity (FC) analysis is a prominent approach to analyzing fMRI data, especially acquired in resting state. The commonly used linear correlation bears an implicit assumption of Gaussianity of the dependence structure. To assess the suitability of linear correlation and the general potential of nonlinear FC measures, we present a framework for testing and estimating the deviation from Gaussianity by comparing mutual information in the data and its Gaussianized counterpart. We apply this method to 24 sessions of human resting state fMRI. While the group-level tests confirmed non-Gaussianity in the FC, the quantitative assessment revealed that the portion of mutual information neglected by linear correlation is relatively minor - on average only about 5% of the total mutual information. We conclude that for this type of data, practical relevance of nonlinear methods trying to improve over linear correlation is limited by the fact that the data are almost Gaussian. Functional connectivity (FC) analysis is a prominent approach to analyzing fMRI data, especially acquired in resting state. The commonly used linear correlation bears an implicit assumption of Gaussianity of the dependence structure. To assess the suitability of linear correlation and the general potential of nonlinear FC measures, we present a framework for testing and estimating the deviation from Gaussianity by comparing mutual information in the data and its Gaussianized counterpart. We apply this method to 24 sessions of human resting state fMRI. While the group-level tests confirmed non-Gaussianity in the FC, the quantitative assessment revealed that the portion of mutual information neglected by linear correlation is relatively minor - on average only about 5% of the total mutual information. We conclude that for this type of data, practical relevance of nonlinear methods trying to improve over linear correlation is limited by the fact that the data are almost Gaussian. (en)
Title	Functional connectivity in resting-state fMRI: Is linear correlation sufficient? Functional connectivity in resting-state fMRI: Is linear correlation sufficient? (en)
skos:prefLabel	Functional connectivity in resting-state fMRI: Is linear correlation sufficient? Functional connectivity in resting-state fMRI: Is linear correlation sufficient? (en)
skos:notation	RIV/67985807:_____/11:00356655!RIV11-MSM-67985807
http://linked.open...avai/predkladatel	Ústav informatiky AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(7E08027), Z(AV0Z10300504)
http://linked.open...iv/cisloPeriodika	3
http://linked.open...vai/riv/dodaniDat	2011
http://linked.open...aciTvurceVysledku	Vejmelka, Martin Hlinka, Jaroslav Paluš, Milan
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav informatiky AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	200526
http://linked.open...ai/riv/idVysledku	RIV/67985807:_____/11:00356655
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	fMRI; functional connectivity; Gaussianity; nonlinearity; correlation; mutual information (en)
http://linked.open.../riv/klicoveSlovo	Gaussianity mutual information correlation fMRI functional connectivity nonlinearity
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[0B91FA2B7421]
http://linked.open...i/riv/nazevZdroje	Neuroimage
http://linked.open...in/vavai/riv/obor	FH
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Large scale interactions in brain networks and their breakdown in brain diseases
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	54
http://linked.open...iv/tvurceVysledku	Hlinka, Jaroslav Paluš, Milan Vejmelka, Martin Corbetta, M. Mantini, D.
http://linked.open...ain/vavai/riv/wos	000286302000044
http://linked.open...n/vavai/riv/zamer	Informatika pro informační společnost: modely, algoritmy, aplikace
issn	1053-8119
number of pages	8 (xsd:int)
is http://linked.open...avai/riv/vysledek of	Functional connectivity in resting-state fMRI: Is linear correlation sufficient? Functional connectivity in resting-state fMRI: Is linear correlation sufficient?

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