Fractal dimension of sustained vowel productions in neurological dysphonias: An acoustic and electroglottographic analysis
- 1 July 1997
- journal article
- letter
- Published by Acoustical Society of America (ASA) in The Journal of the Acoustical Society of America
- Vol. 102 (1), 652-654
- https://doi.org/10.1121/1.419711
Abstract
In order to investigate whether nonlinear methods of signal analysis provide a measure of phonatory irregularities in neurogenic voice disorders, the present study computed the fractal dimension both of the electroglottographic (EGG) and the acoustic signal of sustained vowel productions obtained from patients with Parkinson’s disease (PD) and cerebellar atrophy (CA). Compared with normal speakers, the female PD group as well as the male and female CA patients showed an increased dimension of the EGG. The dimensional complexity of the acoustic signal largely depended on vowel type. Furthermore, the dimension of the acoustic signal was reduced in male PD patients as compared to the respective controls.
Keywords
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