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KMID : 1022420140060040195
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Phonetics and Speech Sciences
2014 Volume.6 No. 4 p.195 ~ p.203
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The Comparison of Aerodynamic Measures in Korean Stop Consonants based on Phonation Types
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Choi Seong-Hee
Choi Chul-Hee
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Abstract
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The aim of this study was to investigate the effects of phonation types ([+/- aspirated], [+/- fortis]) on aerodynamicmeasures with Korean bilabial stops. Sixty-three healthy young adults (30 males, 33 females) participated to evaluate theVOEF (Voicing Efficiency) tasks with bilabial stop consonants /ph/, /p/, /p’/ using Phonatory Aerodynamic System (PAS)Model 6600 (Kay PENTAX Corp, Lincoln Park, NJ). All VOEF measures were significantly influenced by phonation typesexcept RANP(pitch range)(p <.01). For sound pressure, maximum SPL, mean SPL, and Mean SPL during Voicing have beenshown to be significantly greatest in fortis stop /p’/ than aspirated /ph/ and lenis stop /p/ (p<.001). On the other hand, meanpitch after lenis stop was significantly lower than after aspirated and fortis stops (p<.001). Peak expiratory airflow, Targetairflow, and FVC (Expiratory volume) were significantly lowest in fortis stop /p’/ which might be associated with higheraerodynamic resistance while peak air pressure and mean peak air pressure during closure were significantly lower in lenisstop /p/. Additionally, AEFF (Aerodynamic efficiency) was significantly higher in fortis stop /p’/ than lenis stop /p/ as wellas aspirated stop /ph/ (p<.001). Thus, sound pressure, airflow parameters, and aerodynamic resistance made crucial roles indistinguishing fortis /p’/ from lenis stop /p/ and aspirated. Additionally, pitch and subglottal air pressure parameters wereimportant aerodynamic characteristics in distinguishing lenis /p/ from fortis /p’/ and aspirated /ph/. Therefore, accurateaspirated /p/ stop consonant should be elicited when collecting the airflow, intraoral pressure related data with patients withvoice disorders in order to enhance the reliability and relevance or validity of aerodynamic measures using PAS.
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KEYWORD
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Phonation types, Korean stop consonants, Aerodynamic measures, Validity
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