MODULATION OF SCALE-FREE PROPERTIES OF BRAIN ACTIVITY IN MEG - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Accéder directement au contenu
Communication Dans Un Congrès Année : 2012

MODULATION OF SCALE-FREE PROPERTIES OF BRAIN ACTIVITY IN MEG

Nicolas Zilber
  • Fonction : Auteur
  • PersonId : 925412
Philippe Ciuciu
Patrice Abry

Résumé

The analysis of scale-free (i.e., 1/f power spectrum) brain activity has emerged in the last decade since it has been shown that low frequency fluctuations interact with oscillatory activity in electrophysiology, noticeably when exogenous factors (stimuli, task) are delivered to the human brain. However, there are some major difficulties in measuring scale-free activity in neuroimaging data: they are noisy, possibly nonstationary ... Here, we make use of multifractal analysis to better understand the biological meaning of scale-free activity recorded with Magnetoencephalography (MEG) data. On a cohort of 20 subjects, we demonstrate the presence of self-similarity on all sensors during rest and visually evoked activity. Also, we report significant multifractality on the norm of gradiometers. Finally, on the latter signals we show how self-similarity and multifractality are modulated between ongoing and evoked activity.

Domaines

Imagerie
Fichier principal
Vignette du fichier
zilber_revised.pdf (475.22 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

cea-00699905 , version 1 (21-05-2012)

Identifiants

  • HAL Id : cea-00699905 , version 1

Citer

Nicolas Zilber, Philippe Ciuciu, Patrice Abry, Virginie van Wassenhove. MODULATION OF SCALE-FREE PROPERTIES OF BRAIN ACTIVITY IN MEG. IEEE International Symposium on Biomedical Imaging, May 2012, Barcelone, Spain. pp.1531--1534. ⟨cea-00699905⟩
134 Consultations
303 Téléchargements

Partager

Gmail Facebook X LinkedIn More