Task-Specific Organization of Activity in Human Jaw Muscles Coordination of jaw muscle activity for speech production sometimes has been modeled using nonspeech behaviors. This orientation has been especially true in representations of mandibular movement in which the synergy of jaw muscles for speech production has been suggested to be derived from the central pattern generator (CPG) for chewing. ... Research Article
Research Article  |   December 01, 1988
Task-Specific Organization of Activity in Human Jaw Muscles
 
Author Affiliations & Notes
  • Christopher A. Moore
    Department of Communicative Disorders and Sciences, Wichita State University
  • Anne Smith
    Department of Audiology and Speech Sciences, Purdue University
  • Robert L. Ringel
    Department of Audiology and Speech Sciences, Purdue University
Article Information
Research Articles
Research Article   |   December 01, 1988
Task-Specific Organization of Activity in Human Jaw Muscles
Journal of Speech, Language, and Hearing Research, December 1988, Vol. 31, 670-680. doi:10.1044/jshr.3104.670
History: Received November 25, 1987 , Accepted March 18, 1988
 
Journal of Speech, Language, and Hearing Research, December 1988, Vol. 31, 670-680. doi:10.1044/jshr.3104.670
History: Received November 25, 1987; Accepted March 18, 1988

Coordination of jaw muscle activity for speech production sometimes has been modeled using nonspeech behaviors. This orientation has been especially true in representations of mandibular movement in which the synergy of jaw muscles for speech production has been suggested to be derived from the central pattern generator (CPG) for chewing. The present investigation compared the coordination of EMG activity in mandibular muscles over a range of speech and nonspeech tasks. Results of a cross-correlational analysis between EMG signals demonstrated that the muscle synergies of the mandibular system depend on task demands. Contrary to some of the models discussed, continuous speech production yielded activation patterns that were clearly not related to coordinative patterns generated by the chewing CPG.

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