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Related Experiment Videos

Interrelation of mandibular laryngeal functions.

S Cookman1, K Verdolini

  • 1The University of Iowa Department of Speech Pathology and Audiology, and National Center for Voice and Speech, Iowa City, USA.

Journal of Voice : Official Journal of the Voice Foundation
|May 1, 1999
PubMed
Summary

Jaw movements influence voice production. Increased jaw opening and biting pressure raise laryngeal adduction, impacting vocal fold function, especially at conversational pitch.

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Area of Science:

  • Speech science
  • Vocal physiology
  • Biomechanics

Background:

  • Understanding the interplay between the vocal tract and laryngeal function is crucial for speech production.
  • Jaw movements are known to influence speech, but their specific effects on laryngeal dynamics require further investigation.

Purpose of the Study:

  • To investigate the relationship between jaw opening, jaw biting pressure, and laryngeal adduction.
  • To determine if jaw manipulations affect vocal fold closure during phonation.

Main Methods:

  • Twelve healthy adult participants produced sustained /uh/ vowels under varying jaw opening (10-40 mm) and biting pressure (10-200 kPa) conditions.
  • Electroglottography was used to estimate laryngeal adduction via the closed quotient.
  • Experiments were conducted at conversational and high fundamental frequencies.

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Main Results:

  • Laryngeal adduction significantly increased with greater jaw opening at conversational pitch across all participants.
  • Increased jaw biting pressure also led to higher laryngeal adduction in males at conversational pitch.
  • Complex interactions between jaw manipulations, fundamental frequency, and gender were observed.

Conclusions:

  • Jaw posture and muscle tension directly influence laryngeal adduction.
  • Findings suggest biomechanical and neurological mechanisms linking jaw activity to vocal fold function.
  • Further research is needed to fully elucidate these complex relationships in speech production.