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Related Experiment Videos

Sound-producing sources as objects of perception: rate normalization and nonspeech perception.

C A Fowler1

  • 1Haskins Laboratories, New Haven, Connecticut 06511.

The Journal of the Acoustical Society of America
|September 1, 1990
PubMed
Summary

Speech perception research using nonspeech analogs is confounded. Auditory perception focuses on sound-producing events, not acoustic signals, impacting speech versus nonspeech comparisons.

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Area of Science:

  • Auditory Perception
  • Speech Science
  • Psychoacoustics

Background:

  • Researchers compare speech perception to nonspeech analogs to assess specialization.
  • Nonspeech analogs are acoustically similar to speech but not perceived as speechlike.
  • Existing comparisons are argued to be confounded and uninterpretable.

Purpose of the Study:

  • To demonstrate that auditory perception focuses on mechanical events, not acoustic signals.
  • To reveal confounding factors in speech versus nonspeech analog comparisons.
  • To show that classification task responses reflect perceived sound-producing events.

Main Methods:

  • Two experiments designed to investigate auditory perception of mechanical events.
  • Analysis of confounding factors in comparisons between speech and sine wave analogs.

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  • A third experiment to test the 'specialness' of event perception.

    • Main Results:

    • Perceptual experiences are of mechanical events, the causal sources of acoustic signals.
    • Comparisons of speech to sine wave analogs are confounded by the definiteness of causal sources.
    • Classification task responses reflect properties of perceived sound-producing events.

    Conclusions:

    • Auditory perception is fundamentally event perception, not signal perception.
    • Speech-sine wave comparisons do not isolate auditory specialization for speech.
    • Perception of many acoustic events can appear specialized using flawed comparison logic.