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Related Experiment Videos

The sequential development of jaw and lip control for speech.

Jordan R Green1, Christopher A Moore, Kevin J Reilly

  • 1Department of Communicative Disorders, University of Wisconsin-Madison, 1975 Willow Drive, Madison, WI 53706 USA. jordangreen@fac.staff.wisc.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|January 30, 2004
PubMed
Summary

Speech motor development shows jaw control emerges before lip control in young children. This sequential development influences how children acquire speech sounds.

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Area of Science:

  • Speech-language pathology
  • Developmental neuroscience
  • Childhood motor control

Background:

  • Understanding the developmental trajectory of speech articulation is crucial for identifying potential delays or disorders.
  • Previous research has explored various aspects of speech production in children, but the precise sequence of articulator control development remains an area of interest.

Purpose of the Study:

  • To investigate the sequential development of vertical control for the upper lip, lower lip, and jaw during speech production in children aged 1, 2, and 6 years, compared to adults.
  • To determine if the maturation of speech articulators follows a specific order, with implications for speech sound acquisition.

Main Methods:

  • Recorded vertical displacements of the upper lip, lower lip, and jaw during speech tasks across different age groups (1, 2, 6 years, and adults).

Related Experiment Videos

  • Normalized movement traces for amplitude and time to allow for cross-age comparisons.
  • Quantified age-related changes in movement pattern similarity to adult norms and assessed token-to-token stability of articulatory movements.

    • Main Results:

    • One- and 2-year-old children exhibited significantly more adult-like jaw movements compared to their upper and lower lip movements, which were more variable.
    • Upper and lower lip movement patterns progressively became more adult-like with increasing age and maturation.
    • Significant differences in the token-to-token stability of articulatory movements were observed among the age groups.

    Conclusions:

    • The early stages of speech motor development are characterized by non-uniform control of articulators, with the jaw demonstrating earlier maturation than the lips.
    • This sequential development, where jaw control precedes lip control, likely influences the patterns observed in speech sound acquisition.
    • The findings underscore the significant role of the oral motor control system's properties in shaping speech sound development.