Duration of the rhotic approximant /ô/ in spastic dysarthria of different severity levels

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-12
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
61-68
Series
Speech Communication, Volume 125
Abstract
Dysarthria is a motor speech disorder leading to imprecise articulation of speech. Acoustic analysis capable of detecting and assessing articulation errors is useful in dysarthria diagnosis and therapy. Since speakers with dysarthria experience difficulty in producing rhotics due to complex articulatory gestures of these sounds, the hypothesis of the present study is that duration of the rhotic approximant /ô/ distinguishes dysarthric speech of different severity levels. Duration measurements were conducted using the third formant (F3) trajectories estimated from quasi-closed-phase (QCP) spectrograms. Results indicate that the severity level of spastic dysarthria has a significant effect on duration of /ô/. In addition, the phonetic context has a significant effect on duration of /ô/, the I-r-E context showing the largest difference in /ô/ duration between dysarthric speech of the highest severity levels and healthy speech. The results of this preliminary study can be used in the future to develop signal processing and machine learning methods to automatically predict the severity level of spastic dysarthria from speech signals.
Description
Keywords
Rhotic approximant, Dysarthria, Quasi-closed-phase analysis
Other note
Citation
Gurugubelli , K , Vuppala , A , Nonavinakere Prabhakera , N & Alku , P 2020 , ' Duration of the rhotic approximant /ô/ in spastic dysarthria of different severity levels ' , Speech Communication , vol. 125 , pp. 61-68 . https://doi.org/10.1016/j.specom.2020.09.006