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Journal of Speech, Language, and Hearing Research Vol.43 239-255 February 2000.
© American Speech-Language-Hearing Association
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The Physiologic Development of Speech Motor Control

Lip and Jaw Coordination

Jordan R. Green 1
Christopher A. Moore 1
Masahiko Higashikawa 1

Roger W. Steeve 1
1 Department of Speech and Hearing Sciences University of Washington Seattle

jordangreen{at}facstaff.wisc.edu

This investigation was designed to describe the development of lip and jaw coordination during speech and to evaluate the potential influence of speech motor development on phonologic development. Productions of syllables containing bilabial consonants were observed from speakers in four age groups (i.e., 1-year-olds, 2-year-olds, 6-year-olds, and young adults). A video-based movement tracking system was used to transduce movement of the upper lip, lower lip, and jaw. The coordinative organization of these articulatory gestures was shown to change dramatically during the first several years of life and to continue to undergo refinement past age 6. The present results are consistent with three primary phases in the development of lip and jaw coordination for speech: integration, differentiation, and refinement. Each of these developmental processes entails the existence of distinct coordinative constraints on early articulatory movement. It is suggested that these constraints will have predictable consequences for the sequence of phonologic development.

Note:

Currently affiliated with the University of Wisconsin-Madison

KEY WORDS: speech development, motor control, articulatory movement, lips, jaw

Submitted on November 11, 1998
Accepted on July 13, 1999


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