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Related Experiment Video

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Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions
10:13

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Published on: November 25, 2017

A virtual trajectory model predicts differences in vocal fold kinematics in individuals with vocal hyperfunction.

Cara E Stepp1, Robert E Hillman, James T Heaton

  • 1Harvard-MIT Division of Health Sciences and Technology, Cambridge, Massachusetts 02139, USA. cstepp@alum.mit.edu

The Journal of the Acoustical Society of America
|December 2, 2010
PubMed
Summary

Vocal fold kinematics reveal differences in muscle tension. Patients with muscle tension dysphonia showed less kinematic change with faster movements, suggesting higher baseline laryngeal muscle tension.

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Area of Science:

  • Biomechanics of speech production
  • Laryngeal physiology
  • Clinical voice analysis

Background:

  • Increased laryngeal muscle stiffness is hypothesized in vocal hyperfunction.
  • Vocal fold kinematic features may reflect underlying muscle tension.
  • Understanding these dynamics is crucial for diagnosing voice disorders.

Purpose of the Study:

  • To investigate if vocal fold kinematic features correlate with increased muscle stiffness.
  • To test the hypothesis that vocal hyperfunction patients exhibit altered kinematic responses to varying gesture rates.
  • To explore the potential of vocal fold kinematics as a clinical diagnostic tool.

Main Methods:

  • Development of a one-degree-of-freedom virtual trajectory model for vocal fold kinematics.
  • Experimental testing using trans-nasal endoscopy during abductory-adductory tasks.
  • Comparison of kinematic measures across healthy controls, muscle tension dysphonia (MTD), and vocal nodule groups at different gesture rates.

Main Results:

  • Model simulations confirmed stiffness affects kinematic parameters.
  • MTD patients' kinematic measures were less influenced by increased gesture rate compared to controls.
  • Statistically significant differences in kinematic features were observed between control and MTD groups (p<0.05).

Conclusions:

  • Findings support the hypothesis of elevated laryngeal muscle tension in MTD patients.
  • Vocal fold kinematics show potential as an objective clinical assay for vocal hyperfunction.
  • Further research is needed to clarify results in vocal nodule participants.