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KMID : 1022420150070020055
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Phonetics and Speech Sciences
2015 Volume.7 No. 2 p.55 ~ p.62
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Acoustic Characteristics of ‘Short Rushes of Speech’ using Alternate Motion Rates in Patients with Parkinson's Disease
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Kim Sun-Woo
Yoon Ji-Hye
Lee Seung-Jin
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Abstract
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It is widely accepted that Parkinson's disease(PD) is the most common cause of hypokinetic dysarthria, and its characteristics of 'short rushes of speech' have become more evident along with the severity of motor disorders. Speech alternate motion rates (AMRs) are particularly useful for observing not only rate abnormalities but also deviant speech. However, relatively little is known about the characteristics of 'short rushes of speech' in terms of AMRs of PD except for the perceptual characteristics. The purpose of this study was to examine which acoustic features of 'short rushes of speech' in terms of AMRs are a robust indicator of Parkinsonian speech. Numbers of syllabic repetitions (/p?/, /t?/, /k?/) in AMR tasks were analyzed through acoustic methods observing a spectrogram of the Computerized Speech Lab in 9 patients with PD. Acoustically, we found three characteristics of 'short rushes of speech': 1) Vocalized consonants without closure duration(VC) 76.3%; 2) No consonant segmentation(NC) 18.6%; 3) No vowel formant frequency(NV) 5.1%. Based on these results, 'short rushes of speech' may affect the failure to reach and maintain the phonatory targets. In order to best achieve the therapeutic goals, and to make the treatment most efficacious, it is important to incorporate training methods which are based on both phonation and articulation.
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KEYWORD
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Parkinson's disease, hypokinetic dysarthria, short rushes, alternate motion rates, acoustic analysis
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