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Related Experiment Videos

Laryngeal configuration associated with glottography.

B R Gerratt1, D G Hanson, G S Berke

  • 1VA Medical Center, Audiology & Speech Pathology, Los Angeles, CA 90073.

American Journal of Otolaryngology
|July 1, 1988
PubMed
Summary
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This study validates a new method linking glottography to vocal fold vibration. It uses synchronized flashes to precisely correlate vocal fold images with electroglottography (EGG) and photoglottography (PGG) signals.

Area of Science:

  • Laryngology
  • Speech Science
  • Biomedical Engineering

Background:

  • Glottography techniques like EGG and PGG are crucial for studying vocal fold dynamics.
  • Accurate temporal correlation between glottographic signals and actual vocal fold movement remains a challenge.

Purpose of the Study:

  • To present and validate a method for precisely correlating glottographic signals with vocal fold vibratory movements.
  • To demonstrate the utility of this method in documenting various vocal fold configurations.

Main Methods:

  • Utilized a laryngostroboscope with an 80-microsecond flash to capture high-speed photographs of vocal fold movement.
  • Synchronized flash events with electroglottography (EGG) and photoglottography (PGG) recordings.
  • Identified flash-induced impulses on the PGG waveform to mark corresponding photographic frames.

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Main Results:

  • Successfully established a method to time-lock glottographic signals (EGG/PGG) with specific photographic frames of vocal fold vibration.
  • Demonstrated the correlation between glottal events and glottographic signals through a test case with documented vocal fold configurations.

Conclusions:

  • The presented method effectively confirms the relationship between glottography and vocal fold vibratory movements.
  • This technique provides a reliable way to analyze the timing of glottal events in relation to electrophysiological and optical signals.