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Related Experiment Video

Updated: Jun 13, 2026

Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions
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Published on: November 25, 2017

Glottal adjustment for regulating vocal intensity. An experimental study.

S Tanaka, M Tanabe

    Acta Oto-Laryngologica
    |September 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Vocal intensity is controlled at the glottis by laryngeal muscle contractions. Lateral cricoarytenoid muscle contraction increases vocal intensity and glottal resistance, while thyroarytenoid muscle contraction does not affect vocal intensity.

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    Area of Science:

    • Laryngeal Physiology
    • Acoustic Science
    • Bioengineering

    Background:

    • Understanding vocal intensity control is crucial for voice production research.
    • The glottis plays a significant role in modulating vocal intensity.
    • Specific laryngeal muscle functions in vocal intensity regulation require further elucidation.

    Purpose of the Study:

    • To investigate the glottal level control mechanisms of vocal intensity.
    • To differentiate the effects of lateral cricoarytenoid, cricothyroid, and thyroarytenoid muscle contractions on vocal intensity.

    Main Methods:

    • A canine larynx model was insufflated ex vivo.
    • Contractions of lateral cricoarytenoid and cricothyroid muscles were simulated mechanically.
    • Thyroarytenoid muscle contraction was induced via electrical stimulation.
    • Simultaneous measurements of vocal intensity (SPL), subglottal pressure, and mean flow rate were performed.
    • Aerodynamic power and glottal resistance were calculated.

    Main Results:

    • Lateral cricoarytenoid muscle contraction increased vocal intensity and glottal resistance at constant aerodynamic power.
    • Thyroarytenoid muscle contraction maintained constant vocal intensity despite increased glottal resistance.
    • Cricothyroid muscle contraction's effect on vocal intensity appeared indirect, mediated by altered cordal adduction.

    Conclusions:

    • Lateral cricoarytenoid muscle plays a direct role in increasing vocal intensity through cordal adduction.
    • Thyroarytenoid muscle's primary role may not be direct vocal intensity modulation.
    • Cricothyroid muscle influences vocal intensity indirectly by affecting laryngeal muscle coordination.