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MODULATION OF SCALE-FREE PROPERTIES OF BRAIN ACTIVITY IN MEG

Abstract : 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.
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https://hal-cea.archives-ouvertes.fr/cea-00699905
Contributor : Philippe Ciuciu <>
Submitted on : Monday, May 21, 2012 - 7:33:59 PM
Last modification on : Wednesday, June 17, 2020 - 3:25:07 AM
Long-term archiving on: : Friday, November 30, 2012 - 12:00:56 PM

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  • HAL Id : cea-00699905, version 1

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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⟩

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