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Prephonatory laryngeal and chest wall dynamics.

S A Cavallo, R J Baken

    Journal of Speech and Hearing Research
    |March 1, 1985
    PubMed
    Summary

    Vocal fold and chest wall movements during speech preparation are independent. Laryngeal adjustments are timed consistently, while chest wall timing varies with utterance type, showing non-passive rib cage expansion.

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    Area of Science:

    • Speech Science
    • Respiratory Physiology
    • Laryngeal Biomechanics

    Background:

    • Understanding the interplay between laryngeal and chest wall mechanics is crucial for speech production.
    • Prephonatory adjustments prepare the vocal apparatus for phonation, but their coordination remains incompletely understood.

    Purpose of the Study:

    • To investigate the timing and coordination of prephonatory laryngeal and chest wall movements.
    • To determine the contribution of vocal fold behavior to chest wall posturing during speech initiation.

    Main Methods:

    • Utilized a stimulus-response paradigm with brief utterances (/a/, /ha/) from six adult males.
    • Measured chest wall movements with mercury strain gauges.
    • Assessed vocal fold behavior using electroglottography and airflow recordings.

    Main Results:

    • Demonstrated independence between prephonatory laryngeal and chest wall adjustments.
    • Laryngeal adjustments preceded vocal fold oscillation with consistent timing.
    • Chest wall adjustment onset varied based on utterance type (/a/ vs. /ha/).
    • Prephonatory chest wall posturing was not influenced by glottal configuration changes.
    • Rib cage enlargement occurred during vocal fold abduction for /h/, indicating active, not passive, expansion.

    Conclusions:

    • Prephonatory laryngeal and chest wall behaviors are independently controlled systems.
    • Chest wall posturing, particularly rib cage expansion, is an active process during speech preparation, not merely a passive consequence of abdominal changes.

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