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Related Experiment Videos

Open slope quotient: a new glottographic parameter

D H Slavit1, T V McCaffrey

  • 1Department of Otolaryngology, Long Island College Hospital, Brooklyn, New York 11201, USA.

Journal of Voice : Official Journal of the Voice Foundation
|March 1, 1995
PubMed
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Researchers developed the open slope quotient (OSQ), a new objective measure for vocal fold vibration. This parameter effectively quantifies glottal opening dynamics and laryngeal resistance.

Area of Science:

  • Laryngeal physiology
  • Acoustic phonetics
  • Biomedical engineering

Background:

  • Objective vocal fold vibratory pattern measurement is crucial for diagnosing laryngeal disorders.
  • Existing parameters may not fully capture the dynamics of glottal opening and closure.

Purpose of the Study:

  • Introduce and validate a novel objective measurement, the open slope quotient (OSQ).
  • Investigate the relationship between OSQ and key laryngeal parameters like glottic width, tension, resistance, and pressure.

Main Methods:

  • Utilized an excised canine larynx model.
  • Recorded electroglottographic and photoglottographic waveforms, sound intensity, and subglottic pressure.
  • Systematically varied vocal fold tension, glottic width, and airflow rate.

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  • Performed multiple regression analysis.

    • Main Results:

    • The open slope quotient (OSQ) was inversely related to glottic width and vocal fold tension (p < 0.001).
    • OSQ was directly related to glottic resistance and subglottic pressure (p < 0.001).
    • OSQ demonstrated a stronger correlation with glottic width, subglottic pressure, and resistance than the speed quotient.

    Conclusions:

    • The open slope quotient (OSQ) is a reliable objective measure of vocal fold vibratory patterns.
    • OSQ reflects the velocity of vocal fold opening and laryngeal resistance, potentially indicating vocal fold stiffness.