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Estimating phonation threshold pressure

K V Fisher1, P R Swank

  • 1Department of Communication Sciences and Disorders, Northwestern University, Evanston, IL 60208-3570, USA.

Journal of Speech, Language, and Hearing Research : JSLHR
|November 5, 1997
PubMed
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Estimating phonation threshold pressure (PTP) noninvasively is challenging. This study found that nasal airflow and compensatory vocal adjustments can significantly affect PTP measurements, highlighting the need for improved estimation methods.

Area of Science:

  • Laryngology
  • Speech Science
  • Voice Production

Background:

  • Phonation threshold pressure (PTP) is critical for voice function but difficult to measure noninvasively.
  • Previous studies noted difficulties in precise PTP estimation due to motor control limitations during soft phonation.

Purpose of the Study:

  • To investigate the influence of nasal airflow and vowel context on PTP estimation in untrained female speakers.
  • To assess the impact of nasal occlusion on PTP measurements and compensatory vocal behaviors.

Main Methods:

  • Noninvasive PTP estimation using oral pressure measurements.
  • Monitoring nasal airflow during /p/ occlusion in syllable strings.
  • Comparing PTP estimates with and without nasal occlusion.

Related Experiment Videos

Main Results:

  • Nasal airflow was detected during /p/ occlusion in some participants attempting near-threshold phonation.
  • Nasal occlusion led to compensatory changes in glottal adduction and respiratory effort.
  • These compensatory mechanisms may alter noninvasive PTP estimates.

Conclusions:

  • Monitoring nasal airflow is crucial for accurate noninvasive PTP measurement.
  • Current noninvasive methods for estimating PTP require refinement due to confounding factors like nasal airflow and compensatory behaviors.