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:: Volume 22, Issue 3 (10-2013) ::
aud 2013, 22(3): 83-88 Back to browse issues page
Investigation acoustic intelligibility of high and low vowels in healthy adults and those with Parkinson’s disease
Shiva Javadipour1, Ali Ghorbani1, Negin Moradi2, Hamid Nourallahi Moghadam3, Akbar Biglarian4
1- Department of Speech therapy, School of Rehabilitation, Tehran University of Medical Sciences, Iran
2- Department of Speech therapy, Faculty of Rehabilitation Sciences, Ahvaz Jondi Shapour of University of Medical Sciences, Ahvaz, Iran
3- Department of Neurology, School of Medicine, Tehran University of Medical Sciences, Iran
4- Department of Biostatistics, University of Social Welfare and Rehabilitation, Tehran, Iran
Abstract:   (9479 Views)

Background and Aim: Parkinson’s disease (PD) is a progressive neurological disorder resulting from significant decrease of dopamine in the brain. The main and most common symptom of speech disorder associated with Parkinson’s disease, which is kind of dysarthria, is reduction in speech intelligibility. Since this disorder represents damages to acoustic aspects, researchers are attracted to study the relationship between these two disorders. In this study, we assessed the comparison of speech vowels between normal people and patients with Parkinson’s disease.

Methods: In this cross-sectional study, 18 voice samples of patients with Parkinson’s disease and the same number of samples from normal people in a voiceless environment were recorded and analyzed by Praat software. Data analysis was performed by independent samples and Mann-Whitney tests.

Results: All variables investigated in two groups showed significant differences. In adults with Parkinson’s disease , F1-F0 in low vowels showed a considerable reduction in respect to normal people (p <0.001). In addition, F2-F1 in high vowels represented a significant decrease in these patients (p<0.05).

Conclusion: The results indicate that Parkinson’s disease affects formant frequency in patients compared with normal people. Reduction in speech intelligibility can be accurately measured using acoustic procedure.

Keywords: Parkinson’s disease, speech intelligibility, acoustic analysis, vowel
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Type of Study: Research |
Received: 2012/04/4 | Accepted: 2012/09/25 | Published: 2013/10/14
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Volume 22, Issue 3 (10-2013) Back to browse issues page
شنوایی شناسی - دانشگاه علوم پزشکی تهران Bimonthly Audiology - Tehran University of Medical Sciences
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