Abstract
This study examined the effects of three different speaking modes (clear, habitual, and slow speech) on speech production of individuals with and without Parkinson's disease. Twenty-one speakers (13 with Parkinson's, 8 Controls) read the Farm passage in habitual, clear, and slow speech modes. Acoustic analysis involving the assessment of the first and second formant frequencies was performed using: vowel space areas, vowel dispersions, /i-ɑ/ distances measures for both tense and lax vowels produced in each of the speaking conditions. Results revealed that for both groups, the vowel space areas were larger in the clear and slow conditions compared to habitual, with no difference between clear and slow for tense vowels. However, there was no significant difference across any of the speaking conditions for lax vowels. There was a significant difference in vowel dispersion measures, between the habitual and clear speech conditions and also the slow and habitual conditions. But there was no significant difference between the clear and slow conditions for vowel dispersions. With respect to /i-ɑ/ distance, there was a significant difference between the habitual condition and clear speech. Implications of these results will be presented for both Parkinson's disease subjects and normal controls.
Published Version
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