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KMID : 0361419930170040620
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Journal of Korean Academy of Rehabilitation Medicine
1993 Volume.17 No. 4 p.620 ~ p.631
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Acoustic Characteristics of Dysarthria in Congenital Bilateral Perisylvian Syndrome
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Abstract
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Congenital bilateral perisylvian syndrome(CBPS) is a recently described entity diagnosed on the bases of neuroimaging and speech abnormality. All patients have severe orofacial paresis, moderate to severe dysarthria and bilateral perisylvian
dysplasia.
Dysarthria is a striking clinical manifestation of this syndrome and the recognition of specific pattern of dysarthria has the diagnostic significance of this unique syndrome.
We evaluated the acoustic characteristics of dysarthria in 4 CBPS patients who were diagnosed by magnetic resonance imaging(MRI) scaning using digital computerized spectrograph, Visi-Pitch(r) and Nasometer(r).
In the spectrographic analysis, loss of specific characteristics of formants of vowels and increment of noise in the high frequency regions were observed. The voice onset time(VOT) was prolonged in the bilabial and alveolar stop consonant. Total
duration of meaningless words containing two syllables were increased as well. In the Visi-Pitch(r) analysis, mono-pitch and mono-loudness were characterized and diadochokinetic rate was decreased. Nasalance was increased and the slope of
nasalance
was
flat in CBPS patients in comparision with normal subjects.
These findings are reflection of the impairment of facial motor area in the primary motor cortex, which results in altered movement of tongue, lips and velopharynx. The recognition and objective evaluation f the acoustic characteristics of
dysarthria in
the these patients can give a clue for the diagnosis of this syndrome.
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