Modulation of Intermuscular Beta Coherence in Different Rhythmic Mandibular Behaviors

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Abstract

Introduction: Jaw movement during chewing and speech is facilitated by neural activation patterns for opening and closing movements of the mandible. This study investigated anatomic- and task-dependent differences in intermuscular coherence (IMC) and their association with the parameters of jaw muscle activity using surface electromyography (sEMG). Methods: We recorded sEMG activation from bilateral and ipsilateral jaw-closing muscle pairs during non-nutritive and nutritive chewing, and during a syllable repetition task. IMC and cross-correlational analyses between bilateral and ipsilateral muscle pairs were performed. Results: Intermuscular coherence in the beta band was statistically significant between agonist jaw-closing muscle pairs, with beta IMC weaker for rapid syllable repetition compared to chewing tasks. Cross-correlational analysis of muscle co-activation, as well as sEMG burst amplitude, was positively associated with beta IMC strength. Discussion: Beta IMC was influenced heavily by task-dependent behavioral goals and physiologic demands, which was interpreted as evidence of shared neural drive among jaw-closing muscles.

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Usler, E. R., Wei, X., Simione, M., Richburg, B., Stipancic, K. L., & Green, J. R. (2020). Modulation of Intermuscular Beta Coherence in Different Rhythmic Mandibular Behaviors. Frontiers in Human Neuroscience, 14. https://doi.org/10.3389/fnhum.2020.00302

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