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This study aimed to investigate the voice changes via the CPP measures in the idiopathic rapid eye movement sleep behavior disorder (iRBD), a special case of prodromal neurodegeneration, and recently diagnosed and advanced-stage Parkinson's disease (AS-PD) patients using different speaking tasks across noise-free and noisy environments. The sustained vowel phonation, reading of passages, and monologues of 60 early stage untreated PD, 30 advanced-stage Parkinson's disease, 60 iRBD, and 60 healthy control (HC) participants were evaluated. Significant differences were found between the PD groups and controls in sustained phonation via the CPP (p &amp;lt; 0.05) and CPPS (p &amp;lt; 0.01) and the monologue via the CPP (p &amp;lt; 0.01), although neither the CPP nor CPPS measures were sufficiently sensitive to capture the possible prodromal dysphonia in the iRBD. The quality of the CPP and CPPS measures was influenced substantially by the addition of ambient noise. It was anticipated that the CPP measures might serve as a promising digital biomarker in assessing the dysphonia from the early stages of PD.<\/jats:p>","DOI":"10.1121\/10.0009063","type":"journal-article","created":{"date-parts":[[2021,12,28]],"date-time":"2021-12-28T13:13:07Z","timestamp":1640697187000},"page":"4522-4533","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":31,"title":["Validation of cepstral peak prominence in assessing early voice changes of Parkinson's disease: Effect of speaking task and ambient noise"],"prefix":"10.1121","volume":"150","author":[{"given":"Michal","family":"\u0160imek","sequence":"first","affiliation":[{"name":"Department of Circuit Theory, Faculty of Electrical Engineering, Czech Technical University in Prague , Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan","family":"Rusz","sequence":"additional","affiliation":[{"name":"Department of Circuit Theory, Faculty of Electrical Engineering, Czech Technical University in Prague , Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2021,12,28]]},"reference":[{"issue":"11","key":"2023080420475534000_c1","first-page":"S21","article-title":"Prevalence of Parkinson's disease in Europe: A collaborative study of population-based cohorts. 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