Intra-participant variability in Parkinsons disease: An electropalatographic examination of articulation

McAuliffe, M., Ward, E. and Murdoch, B. (2007) Intra-participant variability in Parkinsons disease: An electropalatographic examination of articulation. Advances in Speech-Language Pathology, 9 1: 13-19. doi:10.1080/14417040600921187

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Author McAuliffe, M.
Ward, E.
Murdoch, B.
Title Intra-participant variability in Parkinsons disease: An electropalatographic examination of articulation
Journal name Advances in Speech-Language Pathology   Check publisher's open access policy
ISSN 1441-7049
Publication date 2007
Sub-type Article (original research)
DOI 10.1080/14417040600921187
Volume 9
Issue 1
Start page 13
End page 19
Total pages 7
Place of publication United Kingdom
Publisher Taylor and Francis Ltd
Collection year 2008
Language eng
Subject 730303 Occupational, speech and physiotherapy
321025 Rehabilitation and Therapy - Hearing and Speech
330109 Assessment and Evaluation
380302 Linguistic Processes (incl. Speech Production and Comprehension)
Abstract The articulation of individuals with dysarthria has traditionally been described as consistent. However, conflicting findings have resulted from research examining intra-participant variation in the articulation of individuals with Parkinson's disease (PD) and hypokinetic dysarthria. The current study used electropalatography (EPG) to examine the degree of intra-participant variation in both tongue-palate contact patterns and duration of contact in a group of speakers with PD and hypokinetic dysarthria including consonant imprecision (n=8). The study also aimed to determine if ageing contributed to any articulatory instability observed. Therefore, two control groups were employed consisting of aged adult (n=7) and young adult (n=8) speakers respectively. Participants were asked to read aloud the phrase 'I saw a CVC today' were C = /t/, /s/, and /l/ and V = /a/. Intra-participant variation in tongue-palate contact was measured using the absolute and relative variability indexes. Coefficients of variation of duration of tongue contact were employed to examine intra- participant variation in consonant duration. In contrast to the study hypotheses, similar levels of intra-participant variation were observed across the three groups. However, a trend towards increased intra- participant variation in consonant duration was noted in the group with PD. The results of the study suggest that, at least spatially, the articulatory errors of individuals with PD are consistent across repetitions. Research including increased participant numbers and individuals exhibiting greater severity of dysarthria is required to provide further understanding of intra-participant variation in consonant duration in PD.
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Created: Thu, 24 Apr 2008, 11:03:43 EST by Laura McTaggart on behalf of School of Health & Rehabilitation Sciences