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Journal of Speech, Language, and Hearing Research Vol.46 437-450 April 2003. doi:10.1044/1092-4388(2003/036)
© American Speech-Language-Hearing Association
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Evidence of Motor Programming Deficits in Children Diagnosed With DAS

Lian Nijland 1
Ben Maassen 1

Sjoeke van der Meulen 2
1 University Medical Center Nijmegen Nijmegen, The Netherlands
2 University Hospital Utrecht/Wilhelmina Children's Hospital Utrecht, The Netherlands

l.nijland{at}cukz.umcn.nl

In this study the hypothesis of motor programming involvement in developmental apraxia of speech (DAS) was investigated by studying articulatory compensation. Five children with DAS and 5 normally speaking children (age 5;0 [years;months] to 6;10), and 6 adult women produced utterances in a normal speaking condition and in a bite-block condition in which the mandible was kept in a fixed position. Throughout the utterances, the course of the second formant was used to determine articulatory compensation and the effect of the bite block on anticipatory coarticulation. Results showed that the bite-block condition in normally speaking children, like in adult women, did not affect the extent of anticipatory coarticulation. In the speech of children with DAS, the bite block had large effects on coarticulatory patterns and on vowel quality, which, contrary to expectations, had improved. These results are interpreted as a clear demonstration of deficient motor programming in DAS.

KEY WORDS: developmental apraxia of speech, experimental research, acoustics, children

Submitted on May 22, 2002
Accepted on October 21, 2002






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