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Impact of Parkinson’s disease on prosody production: a systematic review and meta-analysis

Poster B58 in Poster Session B, Tuesday, October 24, 3:30 - 5:15 pm CEST, Espace Vieux-Port

Jules Fumel1, Delphine Bahuaud2, Ethan Weed3, Riccardo Fusaroli3, Anahita Basirat1; 1Univ. Lille, CNRS, UMR 9193 SCALab, F-59000 Lille, France, 2Department of Speech and Language Therapy, Faculty of Medicine, UFR3S, F-59000 Lille, France, 3Linguistics, Cognitive Science and Semiotics, School of Communication and Culture, Aarhus University, Aarhus, Denmark

Parkinson’s disease (PD) leads to changes in verbal communications. Prosody is one of the main aspects often reported as being impaired in PD. Investigating prosody impairments in individuals with PD can shed light on the neurobiological basis of prosody production as PD can be used as a model of basal ganglia dysfunction. The goal of this systematic review and meta-analysis was to examine the extent to which PD impacts the acoustic parameters related to prosody production. We conducted a systematic literature search on Pubmed, PsychINFO, and Web of Science. We focused on fundamental frequency and its variability, intensity and its variability, rate and pauses. A total of 649 records were identified. After checking for inclusion and exclusion criteria, 38 articles were included in the study. For each acoustic measurement and task, effect sizes (Hedges' g) were extracted by comparing groups of individuals with PD with control groups. We estimated pooled effect sizes using Bayesian hierarchical regression models. We observed reliable differences between PD and controls regarding F0 variability and pause duration. The pooled estimated effect size for F0 variability was -0.75 (95% CI: [-1.01; 0.48]; evidence ratio: infinite; credibility: 100%, 47 effect sizes). The pooled estimated effect size for pause duration was 0.49 (95% CI: [0.01; 0.94]; evidence ratio: 41.11; credibility: 98%, 20 effect sizes). No reliable difference was observed for other features. These results provide details about the prosody impairment in PD. Physiological processes such as laryngeal mechanisms could explain these findings. However, the finding regarding intensity seems not to be consistent with a purely physiological-based explanation. Another possibility which seems to be more in line with our finding, namely regarding the increased pause duration, is that PD would impact prosody planning. This latter is in line with recent studies on language impairment in PD. Further studies should investigate the role of physiological versus language process in prosody production in PD.

Topic Areas: Disorders: Acquired, Speech Motor Control

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