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Cortico-muscular synchronization by proprioceptive afferents from the tongue muscles during isometric tongue protrusion.

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Title: Cortico-muscular synchronization by proprioceptive afferents from the tongue muscles during isometric tongue protrusion.
Authors: Maezawa, Hitoshi Browse this author →KAKEN DB
Mima, Tatsuya Browse this author →KAKEN DB
Yazawa, Shogo Browse this author →KAKEN DB
Matsuhashi, Masao Browse this author →KAKEN DB
Shiraishi, Hideaki Browse this author →KAKEN DB
Funahashi, Makoto Browse this author →KAKEN DB
Keywords: magnetoencephalography
cortico-muscular coherence
neural oscillation
muscle spindle
trigeminal nucleus
hypoglossal motor nucleus
Issue Date: 13-Jan-2016
Publisher: Elsevier
Journal Title: NeuroImage
Volume: 128
Start Page: 284
End Page: 292
Publisher DOI: 10.1016/j.neuroimage.2015.12.058
PMID: 26774611
Abstract: Tongue movements contribute to oral functions including swallowing, vocalizing, and breathing. Fine tongue movements are regulated through efferent and afferent connections between the cortex and tongue. It has been demonstrated that cortico-muscular coherence (CMC) is reflected at two frequency bands during isometric tongue protrusions: the beta (β) band at 15-35Hz and the low-frequency band at 2-10Hz. The CMC at the β band (β-CMC) reflects motor commands from the primary motor cortex (M1) to the tongue muscles through hypoglossal motoneuron pools. However, the generator mechanism of the CMC at the low-frequency band (low-CMC) remains unknown. Here, we evaluated the mechanism of low-CMC during isometric tongue protrusion using magnetoencephalography (MEG). Somatosensory evoked fields (SEFs) were also recorded following electrical tongue stimulation. Significant low-CMC and β-CMC were observed over both hemispheres for each side of the tongue. Time-domain analysis showed that the MEG signal followed the electromyography signal for low-CMC, which was contrary to the finding that the MEG signal preceded the electromyography signal for β-CMC. The mean conduction time from the tongue to the cortex was not significantly different between the low-CMC (mean, 80.9ms) and SEFs (mean, 71.1ms). The cortical sources of low-CMC were located significantly posterior (mean, 10.1mm) to the sources of β-CMC in M1, but were in the same area as tongue SEFs in the primary somatosensory cortex (S1). These results reveal that the low-CMC may be driven by proprioceptive afferents from the tongue muscles to S1, and that the oscillatory interaction was derived from each side of the tongue to both hemispheres. Oscillatory proprioceptive feedback from the tongue muscles may aid in the coordination of sophisticated tongue movements in humans.
Rights: © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:歯学院・歯学研究院 (Graduate School of Dental Medicine / Faculty of Dental Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 前澤 仁志

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