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Modulation of Intermuscular Beta Coherence in Different Rhythmic Mandibular Behaviors
Evan R Usler1, Xiaomei Wei2, Meg Simione3
1Department of Communication Sciences and Disorders, College of Health Sciences, University of Delaware, Newark, DE, United States.
Frontiers in Human Neuroscience
|August 28, 2020
Summary
Neural pathways controlling jaw muscles show task-dependent coordination. Beta-band intermuscular coherence (IMC) reflects shared neural drive, varying with chewing versus speech tasks.
Area of Science:
- Neuroscience
- Biomechanics
- Motor Control
Background:
- Jaw movements for chewing and speech rely on complex neural activation patterns.
- Understanding intermuscular coherence (IMC) in jaw muscles is crucial for elucidating motor control strategies.
Purpose of the Study:
- To investigate task-dependent differences in intermuscular coherence (IMC) of jaw muscles.
- To associate IMC with jaw muscle activity parameters during various tasks.
Main Methods:
- Surface electromyography (sEMG) recorded from jaw-closing muscle pairs during chewing and syllable repetition.
- Intermuscular coherence (IMC) and cross-correlational analyses were performed on sEMG data.
Main Results:
- Significant beta-band IMC observed between agonist jaw-closing muscle pairs.
- Beta IMC was weaker during rapid syllable repetition compared to chewing.
- Higher sEMG burst amplitude and muscle co-activation correlated positively with beta IMC strength.
Conclusions:
- Task-dependent behavioral goals and physiological demands significantly influence beta IMC.
- Findings suggest shared neural drive among jaw-closing muscles, modulated by task context.
