Tracking dynamic interactions between structural and functional connectivity: a TMS/EEG-dMRI study

[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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