Abstract
Background and objectiveSpeech impairment is an early symptom of Parkinson's disease (PD). This study has summarized the literature related to speech and voice in detecting PD and assessing its severity. MethodsA systematic review of the literature from 2010 to 2021 to investigate analysis methods and signal features. The keywords “Automatic analysis” in conjunction with “PD speech” or “PD voice” were used, and the PubMed and ScienceDirect databases were searched. A total of 838 papers were found on the first run, of which 189 were selected. One hundred and forty-seven were found to be suitable for the review. The different datasets, recording protocols, signal analysis methods and features that were reported are listed. Values of the features that separate PD patients from healthy controls were tabulated. Finally, the barriers that limit the wide use of computerized speech analysis are discussed. ResultsSpeech and voice may be valuable markers for PD. However, large differences between the datasets make it difficult to compare different studies. In addition, speech analytic methods that are not informed by physiological understanding may alienate clinicians. ConclusionsThe potential usefulness of speech and voice for the detection and assessment of PD is confirmed by evidence from the classification and correlation results.
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