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KMID : 1036820190240041054
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Communication Sciences & Disorders
2019 Volume.24 No. 4 p.1054 ~ p.1065
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Phonatory Onset and Vibratory Characteristics Based on Phonatory Type Using 2D Kymography and High Speed Videolaryngoscopy in Normal Speakers
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Choi Seong-Hee
Joo Min-Sik
Chae Hye-Rim
Choi Chul-Hee
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Abstract
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Objectives: Phonation onset provides an important clinical cue in diagnosing pathologic voice conditions. The aim of this current study was to explore the vocal fold kinematics during three different types (breathy, normal, hard glottal attack) of voice onset with videokymography and high-speed digital imaging. In addition, to elucidate how phonation onset affects vocal fold vibration in stable sections, quantitative parameters were measured in stable vocal fold vibrations.
Methods: High speed digital imaging (HSDI) was obtained from 35 normal young adults with different phonatory onset types (normal, breathy, hard glottal attack). Pre and phonatory onset data were investigated qualitatively with digital kymography (DKG); MinArea, MaxArea, MinOpen, MaxOpen, and speed quotient (SQ), were quantitatively measured by glottal area waveform analysis using Kay’s Image Processing Software; and closed quotient (CQ) and open quotient (OQ) were obtained by 2D DKG using multifunctional examination system.
Results: Significantly higher MinArea were revealed in breathy phonation (p< .001) with no gender effect. With respect to MaxArea, both gender and phonation type effect was observed (p< .001). Significantly larger MaxArea was found in a breathy phonation and the male group. Similar to MinArea, breathy phonation was significantly widest in MinOpen than other phonation types (p< .001). While there were no significant differences in MaxOpen based on phonation types, the MaxOpen of males was significantly wider than that of females (p< .001). SQ was also significantly higher in breathy phonation than normal and hard phonation. On the other hand, OQ and CQ showed significant effect on phonatory type without gender effect.
Conclusion: The onset of vocalization was easily observed through HSDI and DKG, and there were notable differences in pre-phonatory and vibratory onset according to phonatory onset type. In addition, voice onset gesture also affected vocal fold vibration in the steadystate portion.
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KEYWORD
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Phonation onset, GAW, High speed digital imaging, 2D kymography, Phonation type, Normal
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