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KMID : 0921420100150010066
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Korean Journal of Communication Disorders
2010 Volume.15 No. 1 p.66 ~ p.78
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Comparing the Acoustic Character of Diphthong Production between Flaccid Dysarthria and Spastic Dysarthria
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Byeon Hae-Won
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Abstract
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Background & Objectives: Diphthong is accomplished with a fast connection glide and vowel. It is difficult to assess the type of error and position using only the auditory-perceptual evaluation. The purpose of this study is to analyze the acoustic phonetic characteristics of the Korean diphthongs /ja/, /wi/, and /?/ in a word reading assignment between patients with dysarthria (flaccid, two; spastic, four; average age, 58 years) and normal patients (N=10, average age, 57 years).
Methods: Using the computer program “Kalvin (2004),” test words consisting of /h +‘diphthong’ + da/ were shown on a computer monitor. Recorded diphthongs were divided into four sections, and the average formants of each moment were analyzed using ‘Praat’ (version 4.6.06). The results of this study are described below.
Results: First, as a result of analyzing /ja/, changes in the position of a tongue were observed in the spastic dysarthria group, and backing appeared when a diphthong was pronounced. A longer transition time of diphthongs was observed in the flaccid dysarthria group compared to that of the normal group. Second, from the results of analyzing /wi/, more backing was observed in the dysrthria group than in the normal group while the position of the tongue was tuned. Third, as a result of analyzing /?i/, while the levels of the openness of the jaw in the normal group were pronounced in the form of /i/, a single vowel, it can be estimated that /?i/, a diphthong that changes according to the levels of the openness of the tongue was tuned in the flaccid dysarthria group.
Discussion & Conclusion: These results can be used to understand for vowel of dysarthric speech.
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KEYWORD
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Dysarthria, Diphthong, Acoustic
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