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Electrocorticographic dissociation of alpha and beta rhythmic activity in the human sensorimotor system.


ABSTRACT: This study uses electrocorticography in humans to assess how alpha- and beta-band rhythms modulate excitability of the sensorimotor cortex during psychophysically-controlled movement imagery. Both rhythms displayed effector-specific modulations, tracked spectral markers of action potentials in the local neuronal population, and showed spatially systematic phase relationships (traveling waves). Yet, alpha- and beta-band rhythms differed in their anatomical and functional properties, were weakly correlated, and traveled along opposite directions across the sensorimotor cortex. Increased alpha-band power in the somatosensory cortex ipsilateral to the selected arm was associated with spatially-unspecific inhibition. Decreased beta-band power over contralateral motor cortex was associated with a focal shift from relative inhibition to excitation. These observations indicate the relevance of both inhibition and disinhibition mechanisms for precise spatiotemporal coordination of movement-related neuronal populations, and illustrate how those mechanisms are implemented through the substantially different neurophysiological properties of sensorimotor alpha- and beta-band rhythms.

SUBMITTER: Stolk A 

PROVIDER: S-EPMC6785220 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Electrocorticographic dissociation of alpha and beta rhythmic activity in the human sensorimotor system.

Stolk Arjen A   Brinkman Loek L   Vansteensel Mariska J MJ   Aarnoutse Erik E   Leijten Frans Ss FS   Dijkerman Chris H CH   Knight Robert T RT   de Lange Floris P FP   Toni Ivan I  

eLife 20191009


This study uses electrocorticography in humans to assess how alpha- and beta-band rhythms modulate excitability of the sensorimotor cortex during psychophysically-controlled movement imagery. Both rhythms displayed effector-specific modulations, tracked spectral markers of action potentials in the local neuronal population, and showed spatially systematic phase relationships (traveling waves). Yet, alpha- and beta-band rhythms differed in their anatomical and functional properties, were weakly c  ...[more]

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