Abstract
Down syndrome (DS) and Williams syndrome (WS) are genetic disorders resulting from different types of genetic errors. While both disorders lead to phonological and speech motor deficits, particularly little is known about vowel production in DS and WS. Recent work suggests that impaired vowel articulation in DS likely contributes to the poor intelligibility of DS speech. Developmental delays in temporal vowel structure and pitch control have been found in children with WS when compared to their chronological matches. Here, we analyze spontaneous speech samples produced by British children with DS and WI and compare them with typically developing children from the same geographic area in Southern England. We focus on the acquisition of fine-grained phonetic details, asking if children with DS and WS are able to synchronize the phonetic and indexical domains while coping with articulatory challenges related to their respective syndromes. Phonetic details pertaining to the spectral (vowel-inherent spectral change) and indexical (regional dialect) vowel features are examined and vowel spaces are derived from formant values sampled at multiple temporal locations. Variations in density patterns across the vowel space are also considered to define the nature of the acoustic overlap in vowels related to each syndrome.
Published Version
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