Planning of syllables in children with developmental apraxia of speech
SourceClinical Linguistics & Phonetics, 17, 1, (2003), pp. 1-24
Article / Letter to editor
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Interfacultaire Werkgroep Taal en Spraak (IWTS)
Clinical Linguistics & Phonetics
SubjectEBP 1: Determinants of Health and Disease; Structure in Use; UMCN 3.1: Neuromuscular development and genetic disorders; UMCN 3.3: Neurosensory disorders; EBP 1: Determinants of Health and Disease; Structuur in uitvoering
The aim of the present study was to investigate whether children with developmental apraxia of speech (DAS) show a deficit in planning syllables in speech production. Six children with DAS and six normally speaking (NS) children produced high- and low-frequency of occurrence syllable utterances, in which the syllable structure was systematically manipulated in an otherwise unchanging phoneme sequence. Anticipatory coarticulation, using second formant trajectories, and durational structure were analysed. The results showed stronger coarticulation in the children with DAS when compared to the normally speaking children. but in contrast to our expectations, in neither group was a systematic effect of syllable structure on the second format trajectory found. Effects of syllable structure did emerge for durational structure in that durational adjustments were found in the segments of the second syllable. These adjustments were less systematic in children with DAS when compared to normally speaking children. Furthermore, at the prosodic level, normally speaking children showed metrical contrasts that were not realized by the children with DAS. The latter results are interpreted as evidence for a problem in the planning of syllables in speech production of children with DAS, in particular concerning prosodic aspects, which is discussed in relation to the automation of speech production.
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