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KMID : 0384020060170020098
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Journal of the Korean Society of Logopedics and Phoniatrics
2006 Volume.17 No. 2 p.98 ~ p.102
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The Characteristics of Voice Onset Time of the Korean Stops in the Benign Laryngeal Disorders
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Hong Ki-Hwan
Lee Hwa-Uk
Kim Jin-Sung
Lee Eun-Jung
So Sang-Soo
Choi Dong-Il
Yang Yun-Su
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Abstract
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Background and Objectives : Voice onset time(VOT) is defined as the time interval from oral release of a stop consonant to the onset of glottal pulsing in the following vowel. VOT is a temporal characteristics of stop consonants that reflects the complex timing of glottal articulation relative to supraglottal articulation. Stop consonants are characterized by creation of a pressure difference across a complete occlusion in the vocal tract, followed by a sudden release ’’burst’’ due to opening that occlusion. The objects of this study is to evaluate a usefulness of voice onset time in the assessment of voice disorderd patients. Subjects : Subjects were 20 adults with normal voice and with benign laryngeal disorders. Subjects with voice disorders represented the following vocal pathologies : vocal polyp, vocal nodule, Reinke’’s edema and unilateral vocal fold paralysis(UVFP). Control subjects were matched for age (21-40 yews old) and sex(male) with the voice disorders subjects and had normal vocal qualities with no history of voice disorders.
Methods : Each voice-disordered and matched control subject read the test passages containing three types of Korean bilabial consonants. VOT measures were made for the initial /p/, /ph/ and /p’/. VOT was measured using acoustic waveform or wide band spectrogram.
Results : For each voiceless stop consonants, there was a significant difference in VOT between the voice disordered and normal subjects. The mean VOTs of the lax stops in UVFP was significantly shorter than those of control subjects in the UVFP. The mean VOTs of the aspirated stops in the vocal polyp and nodule were longer than those of control subjects, but not significant. The mean VOTs of the glottalized in voice disordered groups were longer than those of control subjects, and significant statistically in the UVFP.
Conclusions : VOT may be a clinically useful acoustic parameter in the assessment of voice disordered patients, especially in the unilateral vocal fold paralysis.
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KEYWORD
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Voice onset time, Benign laryngeal disorders
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