Muscle Activity for Jaw Closing during Speech The incidence and timing of activity in the jaw-closing muscles was investigated during speech. Electromyographic activity was analyzed from the masseter, anterior temporalis, medial pterygoid, and lateral pterygoid muscles in four normal adults. Jaw movement was transduced with a strain-gauge system as the subjects read the Rainbow Passage, 11 different ... Research Article
Research Article  |   December 01, 1981
Muscle Activity for Jaw Closing during Speech
 
Author Affiliations & Notes
  • John W. Folkins
    University of Iowa, Iowa City
Article Information
Research Articles
Research Article   |   December 01, 1981
Muscle Activity for Jaw Closing during Speech
Journal of Speech, Language, and Hearing Research, December 1981, Vol. 24, 601-615. doi:10.1044/jshr.2404.601
History: Received December 3, 1979 , Accepted August 8, 1980
 
Journal of Speech, Language, and Hearing Research, December 1981, Vol. 24, 601-615. doi:10.1044/jshr.2404.601
History: Received December 3, 1979; Accepted August 8, 1980

The incidence and timing of activity in the jaw-closing muscles was investigated during speech. Electromyographic activity was analyzed from the masseter, anterior temporalis, medial pterygoid, and lateral pterygoid muscles in four normal adults. Jaw movement was transduced with a strain-gauge system as the subjects read the Rainbow Passage, 11 different syllables, and trains of the same syllables at four rates. Medial pterygoid was active for all jaw-closing movements. Masseter and temporalis were often active. The incidence of lateral peak electromyographic activity were noted between muscles; however, the duration of activity in medial pterygoid was longer than in masseter and temporalis. A large amount of variability in the relative degree of activity between muscles was observed for repetitions of the same syllable with similar parameters of jaw movements. These data are discussed in relation to series of muscle coordination.

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