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Related Experiment Videos

The expiration reflex in man.

J Korpás, A Misík, G Kalocsayová

    Physiologia Bohemoslovaca
    |January 1, 1975
    PubMed
    Summary

    Mechanical stimulation of vocal folds in humans triggers a specific expiratory reaction, similar to findings in animal studies. This reflex occurs without a preceding inhalation, offering new insights into human vocal fold reflexes.

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    The expiration reflex from the vocal folds.

    Acta physiologica Hungarica·2001

    Area of Science:

    • Laryngology
    • Human Physiology
    • Neuroscience

    Background:

    • The vocal folds play a crucial role in phonation and airway protection.
    • Previous research in experimental animals indicated a specific expiratory reflex upon vocal fold stimulation.

    Purpose of the Study:

    • To investigate whether mechanical stimulation of the vocal folds in humans elicits a similar expiratory reflex as observed in animals.
    • To characterize the nature of the human vocal fold reflex response.

    Main Methods:

    • The study involved 58 human subjects.
    • Oral, pharyngeal, and epiglottal mucosa were anesthetized.
    • Vocal folds were mechanically stimulated using a nylon fiber via indirect laryngoscopy.

    Main Results:

    • Mechanical stimulation of the vocal folds induced a typical expiratory reaction in human subjects.
    • This expiratory reaction was not preceded by inspiration.
    • The observed human response mirrored the typical expiratory reaction previously documented in experimental animals.

    Conclusions:

    • The human vocal fold reflex is characterized by a non-inspiratory expiratory response to mechanical stimulation.
    • This finding supports the cross-species consistency of vocal fold reflex mechanisms.
    • The study provides a basis for further research into the neural pathways governing this reflex.

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