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Glottal area and vibratory patterns studied with simultaneous stroboscopy, flow glottography, and electroglottography

S Hertegård1, J Gauffin

  • 1Department of Logopedics and Phoniatrics, Huddinge University Hospital, Sweden.

Journal of Speech and Hearing Research
|February 1, 1995
PubMed
Summary

This study found significant correlations between estimated and measured glottal areas in male subjects, revealing insights into glottal insufficiency and vocal fold vibration patterns during phonation.

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Area of Science:

  • Laryngology
  • Acoustic phonetics
  • Vocal fold physiology

Background:

  • Understanding vocal fold dynamics is crucial for diagnosing voice disorders.
  • Stroboscopy and glottography are key methods for analyzing phonation.
  • Quantifying glottal area variations provides objective measures of vocal function.

Purpose of the Study:

  • To investigate the relationship between glottal area variations and vibratory patterns during phonation.
  • To compare estimated glottal area measurements with direct measurements using advanced techniques.
  • To explore the correlation between glottographic parameters and glottal insufficiency.

Main Methods:

  • Simultaneous stroboscopy, flow glottography, and electroglottography were employed.
  • Glottal area was estimated from pressure and flow data using van den Berg's formula.

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  • Analysis included male and female subjects with normal speaking patterns.

    • Main Results:

    • Significant correlations were observed between estimated and measured minimum glottal areas in males, indicating glottal insufficiency.
    • Peak glottal area estimations correlated significantly with measurements for areas below 25 mm2.
    • Glottographic parameters in males showed strong correlations with glottal insufficiency and differentiated between phonation modes (normal, pressed, breathy).

    Conclusions:

    • The study highlights the utility of glottographic methods in assessing vocal fold function and identifying glottal insufficiency.
    • Discrepancies in estimated vs. measured glottal areas may be attributed to variations in glottal geometry and acoustic interactions.
    • A 'hump' in the flow glottogram's closed phase suggests the presence of a mucosal wave during vocal fold vibration.