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Related Experiment Video

Updated: Feb 7, 2026

Computerized Adaptive Testing System of Functional Assessment of Stroke
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Abnormal functional corticomuscular coupling after stroke.

Xiaoling Chen1, Ping Xie1, Yuanyuan Zhang1

  • 1Yanshan University, Key Lab of Measurement Technology and Instrumentation of Hebei Province, Qinhuangdao, Hebei 066004, China.

Neuroimage. Clinical
|July 24, 2018
PubMed
Summary
This summary is machine-generated.

Stroke survivors show altered brain-muscle communication, with reduced EEG-biceps coupling and increased EEG-deltoid coupling. This functional corticomuscular coupling (FCMC) research reveals abnormal neural control mechanisms in flexion synergy post-stroke.

Keywords:
Flexion synergyFunctional corticomuscular couplingSeparationStrokeSynkinesis

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Motor dysfunction is a common and debilitating consequence of stroke, often linked to impaired neural control of movement.
  • Understanding the abnormal brain mechanisms underlying movement disorders like "flexion synergy" is crucial for effective rehabilitation.

Purpose of the Study:

  • To investigate the temporal evolution of corticomuscular interaction in stroke patients during shoulder abduction and elbow flexion.
  • To identify abnormal mechanisms in brain control of "flexion synergy" using functional corticomuscular coupling (FCMC).

Main Methods:

  • Recorded 59-channel electroencephalogram (EEG) and 2-channel electromyogram (EMG) from biceps brachii (BB) and deltoid (DT) in 16 stroke patients and 8 healthy controls.
  • Analyzed corticomuscular coupling during two stages of arm movement: uplifting (stage 1) and maintaining (stage 2).

Main Results:

  • Stroke patients exhibited reduced EEG-BB coherence and increased EEG-DT coherence compared to controls.
  • Separate phase patients showed higher gamma-band coupling (stage 1) and beta-band coupling (stage 2) in EEG-BB, but lower beta-band coupling (stage 2) in EEG-DT compared to synkinetic patients.
  • Findings suggest sensorimotor system disorders affect beta and gamma band oscillations in stroke patients.

Conclusions:

  • Stroke-induced motor dysfunction involves altered corticomuscular coupling, impacting neural control of shoulder and elbow movements.
  • Patients may integrate more information for shoulder abduction to compensate for elbow flexion deficits during recovery.
  • This research offers insights into the temporal dynamics of corticomuscular interaction and pathomechanisms of "flexion synergy" after stroke.