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KMID : 0917520010080030173
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Journal of Speech Sciences
2001 Volume.8 No. 3 p.173 ~ p.184
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The Effects of Voice and Speech Intelligibility Improvements in Parkinson Disease by Training Loudness and Pitch
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Abstract
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The purpose of this study was to examine the effcts of manipulation loudness and pitch in terms of speech intelligibility and voice of a patient with Parkinson´s Disease. The subject, who was diagnosed as a patient with Parkinson´s disease 11 years ago, demonstrated a severely breath voice with low intensity. The accuracy of articulatiion in consonants was intelligible only at the single word level, and the overall intelligibility in continuous speech was low.
The results showed that the subject´s articulation accuracy and speech intelligibility was significantly improved after having loudness and pitch training. Habitual Fo, Jitter, Shimmer, Fo tremor, Amp tremor were decreased after training. In addition, the value of HNR also increased after training. It was shown that the changes of these acoustic parameters were closely related to the decrease of breathiness in Parkinson´s voice, and this decrease of breathiness affected speech intelligibility considerably. Based on the experimental results, it was claimed that the vocal training by manipulating the loudness and pitch could be highly effective in improving the voice quality and speech intelligibility in parkinson´s Disease.
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