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Related Experiment Videos

Developmental phonological disorders. III: Long-term speech-sound normalization

L D Shriberg1, F A Gruber, J Kwiatkowski

  • 1Waisman Center on Mental Retardation and Human Development, University of Wisconsin-Madison 53705.

Journal of Speech and Hearing Research
|October 1, 1994
PubMed
Summary

This study followed 10 children with developmental phonological disorders for 7 years. Findings suggest a critical period for speech development, with normalization typically occurring by age 8.5.

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Area of Science:

  • Speech-language pathology
  • Developmental psychology
  • Linguistics

Background:

  • Previous research profiled children with developmental phonological disorders and identified short-term speech-sound normalization correlates.
  • Developmental phonological disorders impact speech sound acquisition in children.

Purpose of the Study:

  • To characterize the long-term sequence, rates, and error patterns of speech-sound normalization in children with developmental phonological disorders.
  • To examine these patterns in relation to developmental perspectives on phonological disorders.
  • To test the hypothesis of a critical period for speech sound development.

Main Methods:

  • Longitudinal study tracking 10 children with developmental phonological disorders.
  • Annual assessments over a 7-year period.

Related Experiment Videos

  • Analysis of speech-sound normalization sequences, rates, and error patterns.

    • Main Results:

    • Detailed characterization of long-term speech-sound normalization trajectories.
    • Identification of specific error patterns during normalization.
    • Speech delay normalization reached a boundary around 8.5 years of chronological age.

    Conclusions:

    • Findings support the hypothesis of a critical period for speech sound development.
    • A chronological age boundary of approximately 8.5 years exists for significant speech delay normalization.
    • Understanding long-term normalization aids in developmental perspectives of phonological disorders.