Simon Little

18 janvier 2019

Attention c’est à 11h !

University of California, San Francisco (UCSF), California, USA & Sobell Department, Institute of Neurology, University College London, London, UK

The when, where, and how of beta bursts in motor control and post - movement updating

invité par Nicole Malfait

Abstract : Beta activity is one of the most robust signals in all of functional neuro-imaging and has been reliably linked to movement preparation and more recently, error monitoring. Classically, beta has been considered in terms of a slowly decreasing average amplitude signal prior to movement and a gradually increasing average amplitude signal following movement. This has conventionally been interpreted in terms of the "Status Quo" framework. However, we have explored high resolution single trial dynamics of beta to show that signal fluctuations are rapid (bursts) and that the timing of these bursts relates to movement initiation and error updating. We also present MEG evidence supporting recent anatomical and modelling efforts that suggest that beta emerges through asymmetrical inputs to deep and superficial cortical laminae. These findings appear incompatible with classical "Status Quo" accounts and require a theoretical reappraisal. We therefore speculate on how these results might suggest a new theoretical framework for beta that can account for rapid dynamics at the level of sensorimotor integration.

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