Behavioural Neurology

Behavioural Neurology / 1999 / Article

Open Access

Volume 11 |Article ID 327643 |

Aileen K. Ho, Robert Iansek, Caterina Marigliani, John L. Bradshaw, Sandra Gates, "Speech Impairment in a Large Sample of Patients with Parkinson’s Disease", Behavioural Neurology, vol. 11, Article ID 327643, 7 pages, 1999.

Speech Impairment in a Large Sample of Patients with Parkinson’s Disease

Received01 Feb 1999
Accepted01 Feb 1999


This study classified speech impairment in 200 patients with Parkinson’s disease (PD) into five levels of overall severity and described the corresponding type (voice, articulation, fluency) and extent (rated on a five-point scale) of impairment for each level. From two-minute conversational speech samples, parameters of voice, fluency and articulation were assessed by two trained-raters. Voice was found to be the leading deficit, most frequently affected and impaired to a greater extent than other features in the initial stages. Articulatory and fluency deficits manifested later, articulatory impairment matching voice impairment in frequency and extent at the ‘Severe’ stage. At the final stage of `Profound' impairment, articulation was the most frequently impaired feature at the lowest level of performance. This study illustrates the prominence of voice and articulatory speech motor control deficits, and draws parallels with deficits of motor set and motor set instability in skeletal controls of gait and handwriting.

Copyright © 1999 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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