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Learning-induced modulation of scale-free properties of brain activity measured with MEG

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.
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Nicolas Zilber, Philippe Ciuciu, Patrice Abry, Virginie van Wassenhove. Learning-induced modulation of scale-free properties of brain activity measured with MEG. 10th IEEE International Symposium on Biomedical Imaging, IEEE, Apr 2013, San Francisco, United States. pp.998-1001, ⟨10.1109/ISBI.2013.6556645⟩. ⟨hal-00859389⟩

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