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LEARNING-INDUCED MODULATION OF SCALE-FREE PROPERTIES OF BRAIN ACTIVITY MEASURED WITH MEG (2013)
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BibTeX
@MISC{Zilber13learning-inducedmodulation,
author = {Nicolas Zilber and Patrice Abry and Virginie Van Wassenhove},
title = {LEARNING-INDUCED MODULATION OF SCALE-FREE PROPERTIES OF BRAIN ACTIVITY MEASURED WITH MEG},
year = {2013}
}
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Abstract
Previous studies have suggested that infraslow brain activity could play an important role in cognition. Its scale-free properties (coarsely described by its 1/f power spectrum) are indeed modulated between contrasted conscious states (sleep vs. awake). However, finer modulations remain to be investigated. Here, we make use of a robust multifractal analysis to investigate the group-level impact of perceptual learning (visual (V), or audiovisual (AV), N = 12 subjects in each group) on the source reconstructed scale-free activity recorded with magnetoencephalography (MEG) during rest and task. We first observed a significant decrease of self-similarity in evoked activity during the task after both trainings. More interestingly, only the most efficient training (AV) induced a decrease of self-similarity in spontaneous activity at rest whereas only V training induced an increase of multifractality in evoked activity. Index Terms — MEG, scale-free activity, scaling, multifractal analysis, plasticity, learning
Keyphrases
scale-free activity evoked activity important role multifractal analysis power spectrum finer modulation previous study sleep v index term meg scale-free property efficient training perceptual learning significant decrease infraslow brain activity spontaneous activity robust multifractal analysis group-level impact conscious state
