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pubmed-article:9146493pubmed:abstractTextEEGs were recorded from sensorimotor areas of 12 subjects performing unilateral self-paced brisk and slow finger movements. Two different beta components were found below 30 Hz: (i) One component, at about twice the frequency of the mu rhythm, showed desynchronization in parallel with the mu rhythm starting at about 2 s prior to movement. Measurements of bicoherence have shown that this beta component can be non-linearly related to the arch-shaped mu rhythm. (ii) Another beta component started to desynchronize about 1 s prior to movement, recovered very fast and displayed a pronounced post-movement beta synchronization (PMBS) within the first second after movement-offset. This PMBS was found in the frequency band between 12 and 26 Hz. The average percentage power increase at contralateral sensorimotor area was 232% (SD = 82%) for brisk and 265% (SD = 102%) for slow movements. The PMBS was of contralateral dominance and is interpreted as a correlate of active inhibition or idling of the primary motor area following movement execution.lld:pubmed
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pubmed-article:9146493pubmed:pagination316-25lld:pubmed
pubmed-article:9146493pubmed:dateRevised2008-9-9lld:pubmed
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pubmed-article:9146493pubmed:articleTitleOn the existence of different types of central beta rhythms below 30 Hz.lld:pubmed
pubmed-article:9146493pubmed:affiliationLudwig Boltzmann-Institute of Medical Informatics and Neuroinformatics, Graz, Austria.lld:pubmed
pubmed-article:9146493pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9146493pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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