The sequential development of jaw and lip control for speech

Jordan R. Green, Christopher A. Moore, Kevin Reilly

Research output: Contribution to journalArticle

145 Citations (Scopus)

Abstract

Vertical displacements of the upper lip, lower lip, and jaw during speech were recorded for groups of 1-, 2-, and 6-year-olds and adults to examine if control over these articulators develops sequentially. All movement traces were complitude- and time-normalized. The developmental course of upper lip, lower lip, and jaw control was examined by quantifying age-related changes in the similarity of each articulator's movement patterns to those produced by adult subjects and by same-age peers. In addition, differences in token-to-token stability of articulatory movement were assessed among the different age groups. The experimental findings revealed that 1- and 2-year-old children's jaw movements were significantly more adult-like than their upper and lower lip movements, which were more variable. In contrast, upper and lower lip movement patterns became more adult-like with maturation. These findings suggest that the earliest stages of speech motor development are constrained by the nonuniform development of articulatory control, with the jaw preceding the lips. The observed developmental patterns suggest that the properties of the oral motor control system significantly influence the pattern of speech sound acquisition.

Original languageEnglish (US)
Pages (from-to)66-79
Number of pages14
JournalJournal of Speech, Language, and Hearing Research
Volume45
Issue number1
DOIs
StatePublished - Jan 1 2002

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Lip
Jaw
Dental Articulators
control system
age group
Phonetics
Age Groups
Group

All Science Journal Classification (ASJC) codes

  • Language and Linguistics
  • Linguistics and Language
  • Speech and Hearing

Cite this

The sequential development of jaw and lip control for speech. / Green, Jordan R.; Moore, Christopher A.; Reilly, Kevin.

In: Journal of Speech, Language, and Hearing Research, Vol. 45, No. 1, 01.01.2002, p. 66-79.

Research output: Contribution to journalArticle

Green, Jordan R. ; Moore, Christopher A. ; Reilly, Kevin. / The sequential development of jaw and lip control for speech. In: Journal of Speech, Language, and Hearing Research. 2002 ; Vol. 45, No. 1. pp. 66-79.
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