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Dynamics of phonatory posturing at phonation onset.

Travis L Shiba1, Dinesh K Chhetri1

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The timing and shape of vocal fold posture before speaking significantly impact voice quality. Pressed phonation shows longer onset times due to glottal resistance and pressure needs.

Keywords:
Speech productiondigital video kymogramlaryngeal posturephonation onset

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Area of Science:

  • Laryngeal biomechanics
  • Speech and voice science
  • Acoustic phonetics

Background:

  • Intrinsic laryngeal muscles establish prephonatory posture before phonation.
  • The dynamics of this posture influence phonation type and quality.

Purpose of the Study:

  • Investigate the dynamics of human laryngeal phonatory posturing.
  • Analyze the timing and features of prephonatory glottal configurations for different phonation types.

Main Methods:

  • High-speed video recording and digital videokymography were used.
  • 27 subjects produced various phonation types (modal, breathy, pressed, sniff-/i/).
  • Timing of adduction to final phonatory posture (FPT), phonation onset time (POT), and phonatory posture time (PPT) were measured.

Main Results:

  • Phonation onset latency varied: modal (409 ms), breathy (534 ms), pressed (696 ms), sniff-/i/ (376 ms).
  • Pressed phonation involved faster closure, complete glottal closure, and supraglottic hyperactivity.
  • Breathy phonation showed slower closure, increased posterior and midmembranous glottal gaps.

Conclusions:

  • Phonation onset latency is shortest for modal and longest for pressed voice.
  • These differences are attributed to glottal resistance and subglottal pressure requirements.
  • Laryngeal muscle dynamics play a crucial role in voice production and phonation control.