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Differential modulations of ipsilateral and contralateral beta (de)synchronization during unimanual force production
Author(s) -
van Wijk B. C. M.,
Beek P. J.,
Daffertshofer A.
Publication year - 2012
Publication title -
european journal of neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 206
eISSN - 1460-9568
pISSN - 0953-816X
DOI - 10.1111/j.1460-9568.2012.08122.x
Subject(s) - neuroscience , primary motor cortex , beta (programming language) , motor cortex , cortex (anatomy) , psychology , synchronization (alternating current) , beta rhythm , electroencephalography , stimulation , computer science , computer network , channel (broadcasting) , programming language
Unilateral movement is usually accompanied by ipsilateral activity in the primary motor cortex (M1). It is still largely unclear whether this activity reflects interhemispheric ‘cross‐talk’ of contralateral M1 that facilitates movement, or results from processes that inhibit motor output. We investigated the role of beta power in ipsilateral M1 during unimanual force production. Significant ipsilateral beta desynchronization occurred during continuous dynamic but not during static force production. Moreover, event‐related time–frequency analysis revealed bilateral desynchronization patterns, whereas post‐movement synchronization was confined to the contralateral hemisphere. Our findings indicate that ipsilateral activation is not merely the result of interhemispheric cross‐talk but involves additional processes. Given observations of differential blood oxygen level‐dependent responses in ipsilateral and contralateral M1, and the correlation between beta desynchronization and the firing rate of pyramidal tract neurons in contralateral M1 during movement, we speculate that beta desynchronization in contra‐ and ipsilateral M1 arises from distinct neural activation patterns.