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Spontaneous Facial Motility In Infancy: A 3d Kinematic Analysis, Jordan R. Green, Erin M. Wilson
Spontaneous Facial Motility In Infancy: A 3d Kinematic Analysis, Jordan R. Green, Erin M. Wilson
Department of Special Education and Communication Disorders: Faculty Publications
Early spontaneous orofacial movements have rarely been studied experimentally, though the motor experiences gained from these behaviors may influence the development of motor skills emerging for speech. This investigation quantitatively describes developmental changes in silent, spontaneous lip and jaw movements from 1 to 12 months of age using optically based 3D motion capture technology. Twenty-nine typically developing infants at five ages (1, 5, 7, 9, and 12 months) were studied cross-sectionally. Infants exhibited spontaneous facial movements at all ages studied. Several age-related changes were detected in lip and jaw kinematics: the occurrence of spontaneous movements increased, movement speed increased, the …
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 …
The Physiologic Development Of Speech Motor Control: Lip And Jaw Coordination, Jordan R. Green, Christopher A. Moore, Masahiko Higashikawa, Roger W. Steeve
The Physiologic Development Of Speech Motor Control: Lip And Jaw Coordination, Jordan R. Green, Christopher A. Moore, Masahiko Higashikawa, Roger W. Steeve
Department of Special Education and Communication Disorders: Faculty Publications
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 …