Relationship between segmental speech errors and intelligibility in speakers with acquired dysarthria
|Title||Relationship between segmental speech errors and intelligibility in speakers with acquired dysarthria|
|Year of Publication||2017|
|Conference Name||Dag van de Fonetiek 2017|
|Authors||Miller, Naomi, Peter Mariën, and Jo Verhoeven|
|Publisher||Nederlandse Vereniging voor Fonetische Wetenschappen|
|Conference Location||Amsterdam, The Netherlands|
The standard approach to dysarthria assessment involves rating 38 perceptual dimensions of speech on a 7- point severity scale (Darley, 1969). The drawbacks of this method are that it (a) reduces the wide range of pronunciation errors to one perceptual dimension (“articulatory imprecision”) and (b) presupposes that the most “severe” speech errors are the greatest barrier to intelligibility.
This study aimed to identify prototypical pronunciation errors in Belgian Dutch speakers with dysarthria and to examine the relationship between segmental speech errors and intelligibility in spontaneous speech. Participants included speakers with acquired dysarthria due to stroke or cerebellar disease (n = 11) and age- matched controls (n = 10). A novel intelligibility test was devised consisting of 120 monosyllabic targets and perceptual errors were identified via an orthographic transcription task. Spontaneous speech was analysed using a listening paradigm that generates quantitative measures of intelligibility (Lagerberg et al., 2014). Common consonant errors included devoicing, fronting and cluster formation. The most common vowel distortions were increased height (kent → kind) and reduced duration (staart → start). Segmental speech errors are discussed with respect to articulatory complexity and functional load. There was only a weak correlation between single-word intelligibility and intelligibility in spontaneous speech.