CASL
Permanent URI for this collectionhttps://eresearch.qmu.ac.uk/handle/20.500.12289/22
Browse
3 results
Search Results
Item Visualising speech: Identification of atypical tongue-shape patterns in the speech of children with cleft lip and palate using ultrasound technology(NHS Greater Glasgow & Clyde and University of Strathclyde, Glasgow, 2018) Lloyd, Susan; Cleland, Joanne; Crampin, Lisa; Campbell, Linsay; Zharkova, Natalia; Palo, PerttiPrevious research by Gibbon (2004) shows that at least 8 distinct error types can be identified in the speech of people with cleft lip and palate (CLP) using electropalatography (EPG), a technique which measures tongue-palate contact. However, EPG is expensive and logistically difficult. In contrast, ultrasound is cheaper and arguably better equipped to image the posterior articulations (such as pharyngeals) which are common in CLP. A key aim of this project is to determine whether the eight error types made visible with EPG in CLP speech described by Gibbon (2004) can be also be identified with ultrasound. This paper will present the first results from a larger study developing a qualitative and quantitative ultrasound speech assessment protocol. Data from the first 20 children aged 3 to 18 with CLP will be presented. Data are spoken materials from the CLEFTNET protocol. We will present a recording format compatible with CAPS-A to record initial observations from the live ultrasound (e.g. double articulations, pharyngeal stops). Two Speech and Language Therapists analysed the data independently to identify error types. Results suggest that all of the error types, for example fronted placement and double articulations can be identified using ultrasound, but this is challenging in real-time. Ongoing work involves quantitative analysis of error types using articulatory measures.Item Visualising speech: Using ultrasound visual biofeedback to diagnose and treat speech disorders in children with cleft lip and palate(NHS Greater Glasgow & Clyde and University of Strathclyde, Glasgow, 2017-09) Cleland, Joanne; Crampin, Lisa; Zharkova, Natalia; Wrench, Alan A.; Lloyd, Susan; Palo, PerttiChildren with cleft lip and palate (CLP) often continue to have problems producing clear speech long after the clefts have been surgically repaired, leading to educational and social disadvantage. Speech is of key importance in CLP from both a quality of life and surgical outcome perspective, yet assessment relies on subjective perceptual methods, with speech and language therapists (SLTs) listening to speech and transcribing errors. This is problematic because perception-based phonetic transcription is well known to be highly unreliable(Howard & Lohmander, 2011) especially in CLP, where the range of error types is arguably far greater than for other speech sound disorders. Moreover,CLP speech is known to be vulnerable to imperceptible error types, such as double articulations which can only be understood with instrumental techniques such as ultrasound tongue imaging (UTI). Incorrect transcription of these errors can result in misdiagnosis and subsequent inappropriate intervention which can lead to speech errors becoming deeply ingrained.Item Using ultrasound to quantify tongue shape and movement characteristics(Allen Press Incorporated, 2013-01) Zharkova, NataliaObjective: Previous experimental studies have demonstrated abnormal lingual articulatory patterns characterising cleft palate speech. Most articulatory information to date has been collected using electropalatography, which records the location and size of tongue-palate contact, but not the tongue shape. The latter type of data can be provided by ultrasound. The present paper aims to describe ultrasound tongue imaging as a potential tool for quantitative analysis of tongue function in speakers with cleft palate. A description of the ultrasound technique as applied to analysing tongue movements is given, followed by the requirements for quantitative analysis. Several measures are described, and example calculations are provided. Measures: Two measures are aimed to quantify overuse of tongue dorsum in cleft palate articulations. Crucially for potential clinical applications, these measures do not require head to transducer stabilisation, because both are based on a single tongue curve. The other three measures compare sets of tongue curves, with the aim to quantify the dynamics of tongue displacement, token-to-token variability in tongue position, and the extent of separation between tongue curves for different speech sounds. Conclusions: All measures can be used to compare tongue function in speakers with cleft palate before and after therapy, as well as to assess their performance against that in typical speakers, and to help in selecting more effective treatments.