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KMID : 0917519980030010038
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Journal of Speech Sciences
1998 Volume.3 No. 1 p.38 ~ p.49
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Some Clinical Aspects of Dysarthria
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Kim Hyun-Gi
Kim Wan-Ho
Seo Jeong-Hwan
Hong Ki-Hwan
Shin Hyo-Keun
Ko Do-Heung
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Abstract
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Dysarthrias are a sort of neuromotor disorders because of the weakness of neuromotor controls. They are classified in six types on the basis of Mayo clinic research: flaccid, spastic, ataxic, hypokinetic, hypekinetic and mixed types. Five dysarthria types are investigated in this study. MRI, EMG, neuropathological tests are essential diagnostic processing. Visi-Pitch and Spectrgraphy, CSL are used for assessing dysarthria speech. Maximum phonation time, diadochokinetic rate, Voice Onset Time and substitution rate are the speech evaluation parameters. Maximum phonation time and diadochokinetic rates are the lowest in case of spastic and ataxic dysarthria. Spastic dysarthria shows the substituted glottalized consonants. However, flaccid, ataxic and hypokinetic dysarthrias show the substituted aspirated consonants. VOT is the longest for hypokinetic dysarthria and the shortest for ataxic dysarthria. Jitter shows higher percentage in comparison with control group. Speech evaluation using experimental phonetic instruments help create on international standardization of speech evaluation for speech disorders.
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KEYWORD
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dysarthria, neuromotor, diadochokinetic rate, jitter, shimmer, VOT, formant
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