title: Cortical network dynamics during foot movements.
abstract: The present work intends to evaluate the dynamics of the cerebral networks during the preparation and the execution of the foot movement. In order to achieve this objective, we have used mathematical tools capable of estimating the cortical activity via high-resolution EEG techniques. Afterwards we estimated, the instantaneous relationships occurring among the time-series of sixteen regions of interest (ROIs) in the Alpha (7-12 Hz) and Beta (13-29 Hz) band through the adaptive multivariate autoregressive models. Eventually, we evaluated the weighted-topology of the cerebral networks by calculating some theoretical graph indexes. The results show that the main structural changes are encoded in the highest spectral contents (Beta band). In particular, during the execution of the foot movement the cingulate motor areas (CM) work as network "hubs" presenting a large amount of outgoing links to the other ROIs. Moreover, the connectivity pattern changes its structure according to the different temporal stages of the task. In particular, the communication between the ROIs reaches its highest level of efficiency during the preparation of the foot movement, as revealed by the "small-world" property of the network, which is characterized by the presence of abundant clustering connections combined with short average distances between the cortical areas.
authors.affiliation: Interdep. Research Centre for Models and Information Analysis in Biomedical Systems, University of Rome Sapienza, Corso V. Emanuele, 244, 00186 Rome, Italy. fabrizio.devicofallani@uniroma1.it
authors.forename: Fabrizio
authors.initials: F
authors.lastname: De Vico Fallani
authors.forename: Laura
authors.initials: L
authors.lastname: Astolfi
authors.forename: Febo
authors.initials: F
authors.lastname: Cincotti
authors.forename: Donatella
authors.initials: D
authors.lastname: Mattia
authors.forename: Maria Grazia
authors.initials: MG
authors.lastname: Marciani
authors.forename: Andrea
authors.initials: A
authors.lastname: Tocci
authors.forename: Serenella
authors.initials: S
authors.lastname: Salinari
authors.forename: Herbert
authors.initials: H
authors.lastname: Witte
authors.forename: Wolfram
authors.initials: W
authors.lastname: Hesse
authors.forename: Shangkai
authors.initials: S
authors.lastname: Gao
authors.forename: Alfredo
authors.initials: A
authors.lastname: Colosimo
authors.forename: Fabio
authors.initials: F
authors.lastname: Babiloni
mesh_terms: D000328:Adult; D000465:Algorithms; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000502:physiology*; D003198:Computer Simulation; D004569:Electroencephalography / Q000379:methods*; D005260:Female; D005528:Foot / Q000294:innervation / Q000502:physiology; D007839:Functional Laterality / Q000502:physiology; D006179:Gyrus Cinguli / Q000502:physiology; D006801:Humans; D008297:Male; D009044:Motor Cortex / Q000502:physiology; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology; D009415:Nerve Net / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology; D011712:Pyramidal Tracts / Q000502:physiology; D012984:Software / Q000592:standards* / Q000639:trends