起声時における声帯振動 : Phonation Neutral Areaと声帯振動
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概要
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The aim of the present study is to investigate the influence of the phonation neutral area (glottal area at rest position) upon the mode of the vibratory movement of the vocal-fold.Ultrasonoglottography (ultrasonic pulse M-mode) and ultrasonic pulse-transmission method were applied to observe the vibration mode of the vocal-fold at the onset of phonation.In addition to these observations, phonation neutral area, frequency and subglottal pressure were measured quantitatively by application of the pressure transducer, and these mutual relations were investigated.The following results were obtained.1) The vocal-folds initially started their vibration with opening movement.2) The amplitude of the vibration within the build up time was lower than that of the steady state.3) Increase in the build up time was induced by the extension of the phonation neutral area.4) Decrease in frequency was induced by the extension of the phonation neutral area, and by the increase in the build up time.5) Elevation of the amplitude of the vibration at the steady state was induced by the extension of the phonation neutral area.6) At the onset of phonation, increase in the subglottal pressure was induced by the extension of the phonation neutral area.7) In the case that the subglottal pressure was constant, increase in frequency was induced by the extension of the phonation neutral area.8) In the case that the phonation neutral area was constant, increase in frequency was induced by the increase in the subglottal pressure.
- 社団法人 日本耳鼻咽喉科学会の論文