CASL
Permanent URI for this collectionhttps://eresearch.qmu.ac.uk/handle/20.500.12289/22
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Item Systematic review of ultrasound visual biofeedback in intervention for speech sound disorders(Wiley, 2019-06-10) Sugden, Eleanor; Lloyd, Susan; Lam, Jenny; Cleland, JoanneBackground As cost and access barriers to ultrasound technology have decreased, interest in using ultrasound visual biofeedback (U-VBF) as a tool for remediating speech sound disorders (SSD) has increased. A growing body of research has investigated U-VBF in intervention for developmental SSD; however, diversity in study design, participant characteristics, clinical methods and outcomes complicate the interpretation of this literature. Thus, there is a need for a synthesis and review of the evidence base for using U-VBF in intervention for SSD.Item The dynamics of voiceless sibilant fricative production in children between 7 and 13 years old: An ultrasound and acoustic study(Acoustical Society of America (ASA), 2018-09-19) Zharkova, Natalia; Hardcastle, William J.; Gibbon, Fiona E.This study reports on dynamic tongue shape and spectral characteristics of sibilant fricatives /s/ and /ʃ/ in Scottish English speaking children aged between 7 and 13 years old. The sequences /əCa/ and /əCi/ were produced by 40 children, with ten participants in each age group, and two-year intervals between successive groups. Productions of the same sequences by ten adults were used for comparison with the children's data. Quantitative dynamic analyses were carried out on spectral information and on ultrasound imaging data on tongue shape. All age groups differentiated between the two consonants in the fricative centroid and in tongue shape. Vowel-on-consonant effects showed consonant-specific patterns across age groups without a consistent increase or decrease in the extent of coarticulation with increasing age. The extent of discriminability between the two fricatives increased with age on both acoustic and articulatory measures. Younger speakers were generally more variable than older speakers. Complementary findings from the centroid and tongue shape measures suggest that age-related differences are due to the ongoing maturation of controlling the tongue in coordination with other articulators, particularly the jaw, throughout childhood.Item The articulatory and acoustic impact of Scottish English /r/ on the preceding vowel-onset(2009) Lilenthal, JanineThis paper demonstrates the use of smoothing spline ANOVA and T tests to analyze whether the influence of syllable final consonants on the preceding vowel differs for articulation and acoustics. The onset of vowels either followed by phrase-final /r/ or by phrase-initial /r/ is compared for two Scottish English speakers. To measure articulatory differences of opposing vowel pairs, smoothing splines of midsagittal tongue shape recorded via ultrasound imaging are compared. For the acoustic data, differences of the first two formant frequencies at the onset are tested. The results confirm that there is no 1:1 mapping between articulation and acoustics. Copyright 2009 ISCA.