Journal
NEUROCOMPUTING
Volume 401, Issue -, Pages 173-181Publisher
ELSEVIER
DOI: 10.1016/j.neucom.2020.03.058
Keywords
Speech disorder; Parkinson's disease; Machine learning; Gaussian processes; Feature selection
Categories
Funding
- Slovak Research and Development Agency [SK-SRB-18-0011, APVV-18-0526, APVV-14-0892]
- Slovak Grant Agency for Science [VEGA 1/0365/19]
- Ministry of Education, Science and Technological Development of the Republic of Serbia [337-00-1072019-0911]
- COST Action [CA15225]
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Parkinson's disease is a progressive neurodegenerative disorder often accompanied by impairment in articulation, phonation, prosody and fluency of speech. In fact, speech impairment is one of the earliest Parkinson's disease symptoms, and may be used for early diagnosis. We present an experimental study of identification of Parkinson's disease and assessment of disease progress from speech using Gaussian processes, which is further combined with Automatic Relevance Determination (ARD) for efficient feature selection. Hyperparameters of ARD covariance functions are learned for each individual feature; therefore, can be used for evaluation of their importance. In that way only a small subset of highly relevant acoustic features is selected, leading to models with better performance and lower complexity. The performance of the proposed method was assessed on two datasets: Parkinson's disease detection dataset, which contains a range of biomedical voice measurements obtained from 31 subjects, 23 of them suffering from Parkinson's disease and 8 healthy subjects; and Parkinson's telemonitoring dataset, containing biomedical voice measurements collected from 42 Parkinson's disease patients for estimation of the disease progress. Gaussian process classification with automatic relevance determination is able to successfully discriminate between Parkinson's disease patients and healthy controls with 96.92% accuracy, outperforming Support Vector Machines and decision tree ensembles (random forests, boosted and bagged decision trees). The usability of Gaussian processes is further confirmed in regression task for tracking the progress of the disease. (C) 2020 Elsevier B.V. All rights reserved.
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