Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics (대한후두음성언어의학회지)

The Korean Society of Laryngology, Phoniatrics and Logopedics. (대한후두음성언어의학회)
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The Characteristics of Voice Onset Time of the Korean Stops in the Benign Laryngeal Disorders

후두질환에 따른 자음의 음성발현시간의 특성

  • Hong, Ki-Hwan (Department of Otolaryngology-HNS, Medical School, Chonbuk National University) ;
  • Lee, Hwa-Uk (Department of Otolaryngology-HNS, Medical School, Chonbuk National University) ;
  • Kim, Jin-Sung (Department of Otolaryngology-HNS, Medical School, Chonbuk National University) ;
  • Lee, Eun-Jung (Department of Otolaryngology-HNS, Medical School, Chonbuk National University) ;
  • So, Sang-Soo (Department of Otolaryngology-HNS, Medical School, Chonbuk National University) ;
  • Choi, Dong-Il (Department of Otolaryngology-HNS, Medical School, Chonbuk National University) ;
  • Ynng, Yoon-Soo (Department of Otolaryngology-HNS, Medical School, Chonbuk National University)
  • 홍기환 (전북대학교 의과대학 이비인후과학교실) ;
  • 이화욱 (전북대학교 의과대학 이비인후과학교실) ;
  • 김진성 (전북대학교 의과대학 이비인후과학교실) ;
  • 이은정 (전북대학교 의과대학 이비인후과학교실) ;
  • 소상수 (전북대학교 의과대학 이비인후과학교실) ;
  • 최동일 (전북대학교 의과대학 이비인후과학교실) ;
  • 양윤수 (전북대학교 의과대학 이비인후과학교실)
  • Published : 2006.12.15
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Abstract

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 $/p/p^h/\;and\;/p'/$. 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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