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Speech and Hearing Sciences

Permanent URI for this collectionhttps://eresearch.qmu.ac.uk/handle/20.500.12289/7192

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Subject: search.filters.subject.Down'S Syndrome

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    Voice quality of children and young people with Down's Syndrome and its impact on listener judgement
    (Queen Margaret University, 2009) Rodger, Rebecca
    Background: Voice quality in Down's syndrome (DS) is accepted as unusual, often perceived as harsh and whispery with lower pitch and altered nasal resonance. Less is known about the resulting impact, particularly in relation to how children and young people with DS are accepted by their peers. Method: This is a quantitative study of the voice quality of children and young people with DS compared to age-matched typically-developing (TD) controls. Expert raters use the Vocal Profile Analysis Scheme to perceptually rate voice, which is compared to instrumental analysis of fundamental frequency, perturbation measures and spectral tilt. The impact of typical and atypical voice quality is evaluated in a study of listener judgments of character, ability, age, gender and social desirability using a specially designed semantic-differential questionnaire completed by special-needs and mainstream education staff and TD peers based on audio-recordings. Results: Perceptually, a number of features, including lip, tongue and jaw settings, pharyngeal constriction and respiratory support were found to be atypical compared to controls, whilst other features, notably phonation type and nasality, echoed typical patterns but were more severe in presentation in the speakers with DS. Contrary to hypotheses only spectral tilt differed significantly in instrumental analysis. All groups of raters judged the speakers with DS significantly more negatively than controls across all questionnaire parameters. TD peers showed a strong preference for the company of TD children over those with DS. Conclusions: Perceptual differences are evident in the voices of children with DS, but these are not always supported by instrumental findings, perhaps indicating that the constellation of differences give rise to more negative perception. Close agreement between education staff groups suggests that children with DS are no more disadvantaged by the perception of teachers in mainstream than in special-schools; however particular difficulties are highlighted for the development of friendships with TD peers.
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    Articulatory characteristics of sibilant production in young people with Down's syndrome
    (Queen Margaret University, Edinburgh, 2014) Timmins, Claire
    Speech production in children with Down’s syndrome (DS) has been found to be variable and inconsistent. Errors are concentrated in consonants that are typically late developing, such as fricatives. It has been suggested that inconsistency in speech production in DS is a result of a motor speech deficit but there is little detailed articulatory evidence to support this claim. This study (with data from MRC grant ‘Assessment and Treatment of Impaired Speech Motor Control in Children with Down's syndrome’ (G0401388)) provides a detailed phonetic analysis of the voiceless sibilants /s/ and /ʃ/, in a group of young people with DS, by means of auditory and articulatory analysis. The aim of the study is to assess fine motor ability and articulation variability at word level production in a group of speakers with well-established difficulties in speech articulation. The study analysed data from 25 children with DS, 10 typically developing children and 8 adult speakers, recorded using EPG. Perceptual measures were compared with quantitative analyses of EPG data, along with visual analysis of articulation patterns based on a new set of articulation taxonomies. The data is presented by group and in the form of 5 case studies. The case studies provide a means to analyse the relationship between articulation and auditory information in detail and to compare these with supplementary motor control measures. The results show presence of atypical articulation patterns for speakers with DS for both perceptually acceptable tokens, and those in error. Higher levels of within-speaker articulation variability are presented in comparison to the TD control group. Further findings suggest presence of articulation patterns in the TD speakers previously unidentified in EPG studies. Similar to previous studies, the results find that speakers with DS are a highly variable group and that speakers display a combination of typical and atypical speech patterns, influenced by speech motor control difficulties.