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The Sequential Development Of Jaw And Lip Control For Speech, Jordan R. Green, Christopher A. Moore, Kevin J. Reilly
The Sequential Development Of Jaw And Lip Control For Speech, Jordan R. Green, Christopher A. Moore, Kevin J. Reilly
Department of Special Education and Communication Disorders: Faculty Publications
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 amplitude- 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 …