Speech and Hearing Sciences
Permanent URI for this collectionhttps://eresearch.qmu.ac.uk/handle/20.500.12289/7192
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Item Single-route and dual-route approaches to reading aloud difficulties associated with dysphasia.(Queen Margaret University, 1999) Mack, S. K.The study of reading aloud is currently informed by two main types of theory: modular dual-route and connectionist single-route. One difference between then theories is the type of word classification system which they favour. Dual-route theory employs the regular-irregular dichotomy of classification, whereas single-route considers body neighbourhoods to be a more informative approach. This thesis explores the reading aloud performance of a group of people with dysphasia from the two theoretical standpoints by employing a specifically prepared set of real and pseudoword stimuli. As well as being classified according to regularity and body neighbourhood, all the real word stimuli were controlled for frequency. The pseudowords were divided into two groups, common pseudowords and pseudohomophones, and classified according to body neighbourhood. There were two main phases to the study. In the first phase, the stimuli were piloted and the response time performances of a group of people with dysphasia and a group of matcehd control people were compared. In the second phase, a series of tasks was developed to investigate which means of word classification best explained the visual lexical decision and reading aloud performance of people with dysphasia. The influence of word knowledge was also considered. The data was analysed both quantitatively and qualitatively. The quantitative analysis of the number of errors made indicated that classification of items by body neighbourhood and frequency provided the more comprehensive explanation of the data. Investigation of the types of errors that were made did not find a significant relationship between word type and error type, but again the results indicated that the influence of frequency and body neighbourhood was stronger than that of regularity. The findings are discussed both in terms of their implications for the two theories of reading aloud and their relevance to clinical practice.Item An investigation of motor control for speech in phonologically delayed children, normally developing children and adults.(Queen Margaret University, 1992) Waters, D. M.Difficulty with phonological acquisition in children is currently widely regarded as a linguistic/cognitive disability but, since speech is a motor as well as a linguistic activity, speech motor control abilities must have a bearing on acquisition of the speech sound system. On the basis of previous studies, measures of speech rate and temporal variability are regarded as indices of level of speech motor control ability. Evidence was sought concerning the possibility that slow maturation of speech motor control abilities may underlie phonological delay in children. Speech timing characteristics were compared in 12 adult speakers (Group A), 12 normal preschool children (Group N, aged 3;8 years -4;10 years, mean age 4;3 years) and 12 age-matched phenologically delayed children {Group P). Measurements were made of phrase and segment durations and temporal variability in multiple tokens of an experimental phrase. The phonological structure of the speech data was also analysed and a measure of speech rate {in segments/second) was derived. The N Group were found to exhibit slower speech rates, generally longer mean phrase and segment durations and higher levels of temporal variability than the A Group. The P Group exhibited significantly slower speech rates than the N Group and there was a trend towards longer phrase and segment durations in the P Group data. With one marginal exception, no significant differences were found between the two child groups on measures of temporal variability. The weight of evidence indicated that speech motor control was less mature in the P Group than in the N Group. The findings lend some support to the view that differences in speech motor maturity may be implicated in phonological acquisition differences. Some implications for the design of therapy procedures are explored. The importance of analysing and taking account of the phonological form of speech data in investigations of speech rate is highlighted.