Multiple phonetically trained-listener comparisons of speech before and after articulatory intervention in two children with repaired submucous cleft palate
Scobbie, James M.
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Roxburgh, Z., Cleland, J. & Scobbie, J. M. (2016) Multiple phonetically trained-listener comparisons of speech before and after articulatory intervention in two children with repaired submucous cleft palate. Clinical Linguistics & Phonetics, 30 (3-5), pp. 398-415.
In Cleft Palate (CP) assessments based on phonetic transcription are the gold standard- therapy outcome measure, despite reliability difficulties. Here we propose a novel perceptual evaluation, applied to ultrasound-visual biofeedback (U-VBF) therapy and therapy using visual articulatory models (VAMs) for two children with repaired submucous CP. Three comparisons were made: post VAM, post U-VBF and overall pre- and post-therapy. Twenty-two phonetically-trained listeners were asked to determine whether pre- or post-therapy recordings sounded closer to the English target-, using their own implicit stored knowledge (prompted via orthographic representation) as a comparison. Results are compared with segment-oriented percent target consonant correct (PTCC) derived from phonetic transcriptions by the authors. Listener judgements and PTCC suggest that both children made improvements using both VAM and U-VBF. Statistical analysis showed listener agreement across all three comparisons, despite agreement being poor. This perceptual evaluation offers a straightforward method of evaluating the effectiveness of interventions and can be used by phonetically trained or lay listeners.