Cortico-muscular coherence parallels coherence of postural tremor and MEG during static muscle contraction.

Abstract:

:Corticokinematic coherence (CKC), i.e., coherence calculated between MEG and an accelerometer signal, recording movement kinematics, can be used for functional mapping of the sensorimotor cortex. Cortical sources of CKC, induced by both voluntary and passive movements, localize at the proximity of sensorimotor cortex. We tested the CKC during a static muscle contraction to compare it with simultaneously measured cortico-muscular coherence (CMC) estimated between MEG and surface EMG to study the role of postural tremor in CMC in ten healthy volunteers. CKC was detectable also during this static task. CKC and CMC spectra had similar power distributions, and sources of CMC and CKC colocalized at the cortex in close proximity of the central sulcus. During the static hold task, the accelerometer signal originates from the postural tremor. The similarities between CMC and CKC indicate that postural tremor is related to CMC in healthy subjects.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Airaksinen K,Lehti T,Nurminen J,Luoma J,Helle L,Taulu S,Pekkonen E,Mäkelä JP

doi

10.1016/j.neulet.2015.06.034

subject

Has Abstract

pub_date

2015-08-18 00:00:00

pages

22-6

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(15)00477-2

journal_volume

602

pub_type

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