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Predicting developmental shifts in perceptual weighting schemes

S Nittrouer1, M E Miller

  • 1Boys Town National Research Hospital, Omaha, Nebraska 68131, USA.

The Journal of the Acoustical Society of America
|April 1, 1997
PubMed
Summary

Children

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Area of Science:

  • Developmental Psychology
  • Speech Perception
  • Linguistics

Background:

  • Speech perception models propose that acoustic property weighting shifts with language experience.
  • Developmental changes in perceptual weighting are empirically supported but underlying mechanisms are unclear.

Purpose of the Study:

  • Investigate factors guiding developmental shifts in perceptual weighting.
  • Test if adults and children weight acoustic properties differently across phonetic environments based on informativeness.

Main Methods:

  • Three experiments manipulated acoustic properties (noise spectra, formant transitions, F3-onset frequency) in fricative-vowel contexts (/s/-/z/ in /a/ and /u/).
  • Adult and child participants labeled fricatives, with perceptual weighting analyzed across experiments.

Main Results:

  • Adults adjusted weighting based on acoustic property informativeness across phonetic environments.
  • Children showed less adjustment, indicating incomplete learning of environment-specific informativeness for acoustic cues.

Conclusions:

  • Developmental shifts in perceptual weighting are guided by learning the relationship between acoustic informativeness and phonetic environment.
  • Children's developing speech perception involves learning how acoustic cues vary in importance across different linguistic contexts.

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