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Development and phonetic differentiation of speech movement patterns.

L Goffman1, A Smith

  • 1Purdue University, West Lafayette, Indiana 47907, USA. goffman@purdue.edu

Journal of Experimental Psychology. Human Perception and Performance
|July 1, 1999
PubMed
Summary

Young children

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Area of Science:

  • Speech motor control
  • Child language acquisition

Background:

  • Hypothesis: Early speech production is generalized, developing distinctiveness later.
  • Focus on lower lip movements in speech development.

Purpose of the Study:

  • Examine distinctiveness and stability of speech movements in children.
  • Investigate the generalized template hypothesis in speech production.

Main Methods:

  • Analyzed lower lip movement shape and stability in 4-year-olds, 7-year-olds, and adults.
  • Used time/amplitude normalization and pattern recognition for movement sequences.
  • Assessed phonetic distinctiveness and spatiotemporal stability.

Main Results:

  • Speech movements in 4-year-olds already showed phonetically distinctive patterns.
  • Movement stability increased with age, indicating developmental maturation.
  • Findings challenge the notion of a purely generalized template in early speech.

Conclusions:

  • Children's speech movements are distinctive by age 4.
  • Motor control for speech becomes more stable with maturation.
  • Early speech production is not based on a simple generalized template.

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