Ipsilateral EEG mu rhythm reflects the excitability of uncrossed pathways projecting to shoulder muscles

Keita Hasegawa, Shoko Kasuga, Kenichi Takasaki, Katsuhiro Mizuno, Meigen Liu, Junichi Ushiba

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Background: Motor planning, imagery or execution is associated with event-related desynchronization (ERD) of mu rhythm oscillations (8-13 Hz) recordable over sensorimotor areas using electroencephalography (EEG). It was shown that motor imagery involving distal muscles, e.g. finger movements, results in contralateral ERD correlating with increased excitability of the contralateral corticospinal tract (c-CST). Following the rationale that purposefully increasing c-CST excitability might facilitate motor recovery after stroke, ERD recently became an attractive target for brain-computer interface (BCI)-based neurorehabilitation training. It was unclear, however, whether ERD would also reflect excitability of the ipsilateral corticospinal tract (i-CST) that mainly innervates proximal muscles involved in e.g. shoulder movements. Such knowledge would be important to optimize and extend ERD-based BCI neurorehabilitation protocols, e.g. to restore shoulder movements after stroke. Here we used single-pulse transcranial magnetic stimulation (TMS) targeting the ipsilateral primary motor cortex to elicit motor evoked potentials (MEPs) of the trapezius muscle. To assess whether ERD reflects excitability of the i-CST, a correlation analysis between between MEP amplitudes and ipsilateral ERD was performed. Methods: Experiment 1 consisted of a motor execution task during which 10 healthy volunteers performed elevations of the shoulder girdle or finger pinching while a 128-channel EEG was recorded. Experiment 2 consisted of a motor imagery task during which 16 healthy volunteers imagined shoulder girdle elevations or finger pinching while an EEG was recorded; the participants simultaneously received randomly timed, single-pulse TMS to the ipsilateral primary motor cortex. The spatial pattern and amplitude of ERD and the amplitude of the agonist muscle's TMS-induced MEPs were analyzed. Results: ERDs occurred bilaterally during both execution and imagery of shoulder girdle elevations, but were lateralized to the contralateral hemisphere during finger pinching. We found that trapezius MEPs increased during motor imagery of shoulder elevations and correlated with ipsilateral ERD amplitudes. Conclusions: Ipsilateral ERD during execution and imagery of shoulder girdle elevations appears to reflect the excitability of uncrossed pathways projecting to the shoulder muscles. As such, ipsilateral ERD could be used for neurofeedback training of shoulder movement, aiming at reanimation of the i-CST.

Original languageEnglish
Article number85
JournalJournal of NeuroEngineering and Rehabilitation
Volume14
Issue number1
DOIs
Publication statusPublished - 2017 Aug 25

Fingerprint

Electroencephalography
Imagery (Psychotherapy)
Pyramidal Tracts
Muscles
Motor Evoked Potentials
Fingers
Transcranial Magnetic Stimulation
Brain-Computer Interfaces
Superficial Back Muscles
Motor Cortex
Healthy Volunteers
Stroke
Neurofeedback

Keywords

  • Brain-computer interface
  • Electroencephalography
  • Event-related desynchronization
  • Stroke rehabilitation

ASJC Scopus subject areas

  • Rehabilitation
  • Health Informatics

Cite this

Ipsilateral EEG mu rhythm reflects the excitability of uncrossed pathways projecting to shoulder muscles. / Hasegawa, Keita; Kasuga, Shoko; Takasaki, Kenichi; Mizuno, Katsuhiro; Liu, Meigen; Ushiba, Junichi.

In: Journal of NeuroEngineering and Rehabilitation, Vol. 14, No. 1, 85, 25.08.2017.

Research output: Contribution to journalArticle

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AU - Kasuga, Shoko

AU - Takasaki, Kenichi

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AU - Liu, Meigen

AU - Ushiba, Junichi

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