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KMID : 1036820140190030352
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Communication Sciences & Disorders
2014 Volume.19 No. 3 p.352 ~ p.360
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Characteristics of Vowel Space and Speech Intelligibility in Patients with Spastic Dysarthria
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Kim Sung-Yun
Kim Jung-Hwan
Ko Do-Heung
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Abstract
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Objectives: Characteristics of dysarthria include decreased speech intelligibility and changes in vowel space parameters, but details on spastic type have not been reported in Korea. The objective of this study is to determine if there is any difference in speech intelligibility or the parameters related to the vowel space between people with no speech disorders and patients with spastic dysarthria.
Methods: This study consists of total 30 subjects, 15 in the spastic dysarthria group and 15 in the normal control group, comparing speech intelligibility, vowel space area, and related parameters (vowel articulatory index, formant centralization ratio [FCR], and F2 ratio).
Results: First, for the interval scale of speech intelligibility at the level of context vowels, the control group had a median of 1.02 points and the patient group had a median of 2.07 points (p<0.001). Second, the spastic dysarthria group had smaller vowel space area, smaller vowel articulatory index value, greater FCR, and smaller F2 ratio than the normal group (p<0.05).
Conclusion: This study shows decreased speech intelligibility and vowel space in spastic dysarthria patients with objective data from vowel-space-related parameters (such as vowel space area itself, vowel articulatory index, formant centralization ratio, and F2 ratio).
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KEYWORD
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Dysarthria, Vowel space, Intelligibility, Acoustic analysis
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