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2016-07-20 - Colloque/Abstract - Anglais - 1 page(s)

Roland Virginie , Delvaux Véronique , Huet Kathy , Piccaluga Myriam , Haelewyck Marie-Claire , Harmegnies Bernard , "Preserving speech dynamics in Parkinson's disease: an acoustic study of the production of glides by Belgian French patients" in LabPhon15, New York, USA, 2016

  • Codes CREF : Orthopédagogie (DI4619), Métrologie (DI2160), Phonétique (DI5312), Acoustique (DI1264)
  • Unités de recherche UMONS : Métrologie et Sciences du langage (P362)
  • Instituts UMONS : Institut de recherche en sciences et technologies du langage (Langage)
Texte intégral :

Abstract(s) :

(Anglais) In this study, we investigate the dynamics of supra-laryngeal articulators in Parkinson's Disease (PD). We report on an acoustic study of the production of glides and steady vowels by 9 Belgian French non dysarthric PD speakers (6 male, 3 female, aged 52-77) and 10 control speakers. They were administered 3 self-assessment questionnaires (VHI; PDQ-39; MHAVIE 4.0) as well as speech tasks including the production of sustained oral vowels [a,i,u] and V1[a,u]C[glide]V2[a,i,u] pseudo-words, the repetition of CV(C)CV pseudo-words and the reading of a short text. Acoustic measurements include duration and formant frequencies (all vocoid segments), slopes of F2 trajectories (glides), and time from V1 onset to the point where F2 reached its extreme within the glide (VCV pseudo-words). Results suggest that non dysarthric Parkinsonian speakers maintain an accurate production of glides in VCV pseudo-words at the expense of articulatory undershoot in the surrounding vowels, and some assymetry between the V1-to-glide and glide-to-V2 articulatory movements. We discuss how these results both support and challenge the accuracy-timing trade-off hypothesis (Ackermann & Ziegler, 1991), and more generally how laboratory studies of the dynamics of supra-laryngeal articulators in vocoids may shed light on speech motor control in PD, especially when dysarthria is infraclinic.