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Contralateral dominance of corticomuscular coherence for both sides of the tongue during human tongue protrusion: An MEG study.

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Title: Contralateral dominance of corticomuscular coherence for both sides of the tongue during human tongue protrusion: An MEG study.
Authors: Maezawa, Hitoshi Browse this author →KAKEN DB
Mima, Tatsuya Browse this author →KAKEN DB
Yazawa, Shogo Browse this author
Matsuhashi, Masao Browse this author →KAKEN DB
Shiraishi, Hideaki Browse this author →KAKEN DB
Hirai, Yoshiyuki Browse this author
Funahashi, Makoto Browse this author →KAKEN DB
Keywords: Hypoglossal motor nucleus
Isometric muscle contraction
Neural oscillation
Primary motor cortex
Issue Date: 1-Nov-2014
Journal Title: NeuroImage
Volume: 101
Start Page: 245
End Page: 255
Publisher DOI: 10.1016/j.neuroimage.2014.07.018
PMID: 25038437
Abstract: Sophisticated tongue movements contribute to speech and mastication. These movements are regulated by communication between the bilateral cortex and each tongue side. The functional connection between the cortex and tongue was investigated using oscillatory interactions between whole-head magnetoencephalographic (MEG) signals and electromyographic (EMG) signals from both tongue sides during human tongue protrusion compared to thumb data. MEG-EMG coherence was observed at 14-36Hz and 2-10Hz over both hemispheres for each tongue side. EMG-EMG coherence between tongue sides was also detected at the same frequency bands. Thumb coherence was detected at 15-33Hz over the contralateral hemisphere. Tongue coherence at 14-36Hz was larger over the contralateral vs. ipsilateral hemisphere for both tongue sides. Tongue cortical sources were located in the lower part of the central sulcus and were anterior and inferior to the thumb areas, agreeing with the classical homunculus. Cross-correlogram analysis showed the MEG signal preceded the EMG signal. The cortex-tongue time lag was shorter than the cortex-thumb time lag. The cortex-muscle time lag decreased systematically with distance. These results suggest that during tongue protrusions, descending motor commands are modulated by bilateral cortical oscillations, and each tongue side is dominated by the contralateral hemisphere.
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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