Evidence of Motor Programming Deficits in Children Diagnosed With DAS 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 ... Research Article
Research Article  |   April 01, 2003
Evidence of Motor Programming Deficits in Children Diagnosed With DAS
 
Author Affiliations & Notes
  • Lian Nijland
    University Medical Center Nijmegen, Nijmegen, The Netherlands
  • Ben Maassen
    University Medical Center Nijmegen, Nijmegen, The Netherlands
  • Sjoeke van der Meulen
    University Hospital Utrecht/Wilhelmina Children's Hospital, Utrecht, The Netherlands
  • Contact author: Lian Nijland, 954 Department of Pediatric Neurology, University Medical Center St. Radboud, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands. E-mail: l.nijland@cukz.umcn.nl
Article Information
Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   April 01, 2003
Evidence of Motor Programming Deficits in Children Diagnosed With DAS
Journal of Speech, Language, and Hearing Research, April 2003, Vol. 46, 437-450. doi:10.1044/1092-4388(2003/036)
History: Received May 22, 2002 , Accepted October 21, 2002
 
Journal of Speech, Language, and Hearing Research, April 2003, Vol. 46, 437-450. doi:10.1044/1092-4388(2003/036)
History: Received May 22, 2002; Accepted October 21, 2002
Web of Science® Times Cited: 22

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.

Acknowledgments
We gratefully acknowledge the Netherlands Organization for Scientific Research (NWO) and the Hersenstichting Nederland for funding this project. This research was made possible by a grant awarded to the first author by the Foundation for Behavioral and Educational Sciences of NWO (575-56-084) and a grant awarded to the second and third authors by the Hersenstichting Nederland (7F99.06). We also thank Marjolein Bellaar and Rody Aldenhoven for their work on the bite-block data.
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