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Stimulus order effects in vowel discrimination.

B H Repp1, R G Crowder

  • 1Haskins Laboratories, New Haven, Connecticut 06511-6695.

The Journal of the Acoustical Society of America
|November 1, 1990
PubMed
Summary
This summary is machine-generated.

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Listeners perceive vowel sounds differently based on presentation order. The first vowel in a pair appears to shift towards the center of the tested range, not towards a neutral schwa sound.

Area of Science:

  • Psychoacoustics
  • Auditory Perception
  • Speech Science

Background:

  • Order effects are common in same-different discrimination tasks with auditory stimuli.
  • The neutralization hypothesis proposed that the first vowel shifts towards schwa in memory.

Purpose of the Study:

  • To test the neutralization hypothesis regarding vowel perception.
  • To investigate presentation order effects in vowel discrimination.

Main Methods:

  • Three experiments used various vowel sounds in same-different discrimination tasks.
  • Stimulus sets varied in size to assess effects on perception.

Main Results:

  • Initial support for the neutralization hypothesis was found with large stimulus sets.

Related Experiment Videos

  • Conflicting evidence emerged with smaller stimulus sets, showing a drift towards the interior of the stimulus range.

    • Conclusions:

    • The first vowel's perceptual shift is not consistently towards schwa.
    • Vowel perception is influenced by the stimulus range and presentation order, suggesting a drift towards the center of the tested auditory space.