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KMID : 1022420120040030161
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Phonetics and Speech Sciences
2012 Volume.4 No. 3 p.161 ~ p.169
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Characteristics of Speech Intelligibility and the Vowel Space in Patients with Parkinson’s disease
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Shim Hee-Jeong
Park Won-Kyoung
Ko Do-Heung
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Abstract
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The purpose of this study was to investigate the characteristics of speech intelligibility of spontaneous speech and the vowel space parameters in patients with Parkinson’s disease. Ten PD patients (M=5, F=5) and a corresponding control group of ten normal adults participated in this study. Firstly, subjects were asked to tell a story about their hometown and youth in order to analyze speech intelligibility. Secondly, the subjects were also asked to repeat four vowels (/a/, /i/, /u/, /e/) five times in order to compare their vowel spaces. The results were as follows: (1) the speech intelligibility of the PD group was lower than that of the control group. (2) Four parameters including vowel area, vowel articulatory index, formant centralization ratio, F2i/F1u ratio were significantly different in each group. For instance, vowel area and F2 ratio were wider and higher, respectively. As a result, a decrease in speech intelligibility of patients with PD is likely to show different types of errors from the normal group. The results of this research are meaningful in a sense that they could provide the objective standard of speech intelligibility and vowel space parameters.
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KEYWORD
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Parkinson’s disease, speech intelligibility, vowel space, vowel articulatory index, formant centralization ratio, F2i/F1u ratio
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