Article (Scientific journals)
Tracking dynamic interactions between structural and functional connectivity: a TMS/EEG-dMRI study
Amico, Enrico; BODART, Olivier; Rosanova, Mario et al.
2017In Brain Connectivity
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Abstract :
[en] Transcranial magnetic stimulation (TMS) in combination with neuroimaging techniques allows to measure the effects of a direct perturbation of the brain. When coupled to high density electroencephalography (TMS/hd-EEG), TMS pulses revealed electrophysiological signatures of different cortical modules in health and disease. However, the neural underpinnings of these signatures remain unclear. Here, by applying multimodal analyses of cortical response to TMS recordings and diffusion magnetic resonance imaging (dMRI) tractography, we investigated the relationship between functional and structural features of different cortical modules in a cohort of awake healthy volunteers. For each subject we computed directed functional connectivity interactions between cortical areas from the source reconstructed TMS/hd- EEG recordings and correlated them with the correspondent structural connectivity matrix extracted from dMRI tractography, in three different frequency bands (alpha, beta, gamma) and two sites of stimulation (left precuneus and left premotor). Each stimulated area appeared to mainly respond to TMS by being functionally elicited in specific frequency bands, i.e. beta for precuneus and gamma for premotor. We also observed a temporary decrease in the whole-brain correlation between directed functional connectivity and structural connectivity after TMS in all frequency bands. Notably, when focusing on the stimulated areas only, we found that the structurefunction correlation significantly increases over time in the premotor area contralateral to TMS. Our study points out the importance of taking into account the major role played by different cortical oscillations when investigating the mechanisms for integration and segregation of information in the human brain.
Disciplines :
Neurology
Author, co-author :
Amico, Enrico
BODART, Olivier  ;  Centre Hospitalier Universitaire de Liège - CHU > Département de médecine interne > Service de neurologie
Rosanova, Mario
Gosseries, Olivia  ;  Université de Liège > Centre de recherches du cyclotron
Heine, Lizette ;  Université de Liège > Centre de recherches du cyclotron
Van Mierlo, Pieter
Martial, Charlotte  ;  Université de Liège > GIGA : Coma Group
Massimini, Marcello
Marinazzo, Daniele 
Laureys, Steven   ;  Université de Liège > GIGA : Coma Group
 These authors have contributed equally to this work.
Language :
English
Title :
Tracking dynamic interactions between structural and functional connectivity: a TMS/EEG-dMRI study
Publication date :
2017
Journal title :
Brain Connectivity
ISSN :
2158-0014
eISSN :
2158-0022
Publisher :
Mary Ann Liebert, New Rochelle, United States - New York
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 April 2017

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