Mismatch Negativity Responses in Children With a Diagnosis of Childhood Apraxia of Speech (CAS) Purpose To evaluate whether a hypothesis suggesting that apraxia of speech results from phonological overspecification could be relevant for childhood apraxia of speech (CAS). Method High-density EEG was recorded from 5 children with CAS and 5 matched controls, ages 5–8 years, with and without CAS, as they listened ... Research Article
Research Article  |   November 01, 2012
Mismatch Negativity Responses in Children With a Diagnosis of Childhood Apraxia of Speech (CAS)
 
Author Affiliations & Notes
  • Karen Froud
    Teachers College, Columbia University, New York, NY
  • Reem Khamis-Dakwar
    Adelphi University, Garden City, NY
  • Correspondence to Karen Froud: kf2119@columbia.edu
  • Authors are listed alphabetically in the byline. Note that both authors made equal contributions to this work.
    Authors are listed alphabetically in the byline. Note that both authors made equal contributions to this work.×
  • Editor: Carol Scheffner Hammer
    Editor: Carol Scheffner Hammer×
  • Associate Editor: Ken Bleile
    Associate Editor: Ken Bleile×
Article Information
Speech, Voice & Prosodic Disorders / Apraxia of Speech & Childhood Apraxia of Speech / Speech, Voice & Prosody / Research Articles
Research Article   |   November 01, 2012
Mismatch Negativity Responses in Children With a Diagnosis of Childhood Apraxia of Speech (CAS)
American Journal of Speech-Language Pathology, November 2012, Vol. 21, 302-312. doi:10.1044/1058-0360(2012/11-0003)
History: Received January 4, 2011 , Revised September 23, 2011 , Accepted April 8, 2012
 
American Journal of Speech-Language Pathology, November 2012, Vol. 21, 302-312. doi:10.1044/1058-0360(2012/11-0003)
History: Received January 4, 2011; Revised September 23, 2011; Accepted April 8, 2012
Web of Science® Times Cited: 7

Purpose To evaluate whether a hypothesis suggesting that apraxia of speech results from phonological overspecification could be relevant for childhood apraxia of speech (CAS).

Method High-density EEG was recorded from 5 children with CAS and 5 matched controls, ages 5–8 years, with and without CAS, as they listened to randomized sequences of CV syllables in two oddball paradigms: phonemic (/ba/, /pa/) and allophonic (/pa/, /pha/).

Results In the phonemic contrast condition, mismatch negativity (MMN) responses to oddball sounds were observed for the typically developing (comparison) group but not the CAS group, although a component similar to an immature mismatch response was apparent. The allophonic contrast did not elicit MMN responses in the comparison group, but in the CAS group, an MMN-like response was observed.

Conclusion The authors propose that these preliminary findings are consistent with a view of CAS as a disorder that not only affects motor planning but also has a phonological component.

Acknowledgments
We thank the children who participated in this study, their parents, the Cherry Hill (New Jersey) Apraxia Support Group, and Apraxia Kids for their kind cooperation. We would also like to thank all at the Neurocognition of Language Lab, Teachers College, Columbia University, for their assistance and support. Special thanks to Melissa Randazzo for invaluable support at every stage of the study.
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