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Directional Perilaryngeal Functional Muscle Network Indicates Sequential Patterns of Muscle Coordination During Vocal

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    This study reveals that infrahyoid muscles lead laryngeal muscle activation during vocal tasks. The directional muscle network response correlates with loudness and pitch, offering insights into vocal control.

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    Area of Science:

    • * Neuroscience of speech production
    • * Laryngeal biomechanics
    • * Voice motor control

    Background:

    • * Understanding the complex interplay of laryngeal muscles during voice production is crucial for diagnosing and treating voice disorders.
    • * Previous research has primarily focused on individual muscle activity rather than their coordinated network dynamics.

    Purpose of the Study:

    • * To investigate, for the first time, the directional communication within the perilaryngeal muscle network during various vocal tasks.
    • * To determine if the muscle network's response varies with vocal parameters like loudness and pitch.
    • * To identify leading muscles in the laryngeal network activation sequence.

    Main Methods:

    • * Surface electromyography (sEMG) signals were recorded from twelve sites across six laryngeal muscles in eight healthy subjects.
    • * Ten distinct vocal tasks were performed, categorized into sustained phonation, single-repetition tasks, and reading tasks.
    • * Partial directed coherence analysis was employed to assess directional muscle network interactions.

    Main Results:

    • * A significant outward directional flow (higher out-degree than in-degree) was observed from infrahyoid muscles to other laryngeal muscles (p<0.001).
    • * The network's weighted clustering coefficient increased proportionally with rising loudness and pitch during sustained phonation (p<0.003).
    • * Infrahyoid muscles consistently received neural drive before other muscles in the network.

    Conclusions:

    • * The infrahyoid muscles act as the primary drivers in the perilaryngeal muscle network, initiating coordinated activation during phonation.
    • * The directional muscle network exhibits adaptability, responding dynamically to changes in vocal task parameters such as loudness and pitch.
    • * This study introduces a novel method for analyzing vocal control, with potential applications in assessing vocal health and performance.