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Articulatory-rate context effects in phoneme identification.

G R Kidd1

  • 1Department of Speech and Hearing Sciences, Indiana University, Bloomington 47405.

Journal of Experimental Psychology. Human Perception and Performance
|November 1, 1989
PubMed
Summary

The pattern of speech rate changes in a preceding phrase influences how listeners perceive consonant voicing. Dynamic temporal expectancies, not just speech speed, shape auditory perception of speech sounds.

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Area of Science:

  • Phonetics and Speech Science
  • Auditory Perception
  • Psycholinguistics

Background:

  • Articulatory rate variations can impact speech perception.
  • Previous research explored effects of speech rate on phonetic categorization.

Purpose of the Study:

  • To investigate how the pattern of articulatory rate changes in a precursor phrase affects perception of syllable-initial velar stops.
  • To determine if rate effects are context-dependent and how pause duration influences voice-onset time (VOT) boundaries.

Main Methods:

  • Recorded fast and slow precursor phrases, creating varied rate-change patterns.
  • Presented listeners with target syllables from a /gi/-/ki/ voice-onset-time (VOT) continuum following these precursors.
  • Analyzed listener judgments of syllable identity after variable pauses.

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Main Results:

  • Articulatory rate effects extended beyond the immediate target syllable context.
  • Perceptual effects were driven by the pattern of rate changes, not speech proximity or duration.
  • Shortened pause durations resulted in VOT boundary shortening, contrary to prior findings.

Conclusions:

  • Dynamic temporal expectancies play a crucial role in processing temporal speech information.
  • Findings have implications for theories of extrinsic versus intrinsic speech timing mechanisms.
  • The pattern of speech rate change is a significant factor in phonetic perception.