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Discovering phonetic coherence in acoustic patterns.

C T Best, M Studdert-Kennedy, S Manuel

    Perception & Psychophysics
    |March 1, 1989
    PubMed
    Summary
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    Listeners perceive speech coherence by recognizing acoustic patterns from articulatory gestures. This study shows speech listeners, unlike music listeners, can interpret distorted patterns as speech, supporting the articulatory hypothesis.

    Area of Science:

    • Auditory Perception
    • Phonetics
    • Psychoacoustics

    Background:

    • Listeners perceive coherent phonetic patterns despite signal discontinuities.
    • The basis for speech coherence is debated: cue integration, auditory form perception, or recognition of articulatory gestures.

    Purpose of the Study:

    • To test whether speech coherence arises from recognizing articulatory gestures.
    • To differentiate between auditory form perception and articulatory gesture hypotheses for speech perception.

    Main Methods:

    • Three experiments trained listeners on modulated sine wave patterns.
    • Listeners were trained either as "speech listeners" or "music listeners" to perceive phonetic or auditory contrasts.
    • Patterns were modeled after synthetic speech syllables and musical chords.

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    Main Results:

    • Music listeners failed to integrate patterns or perceive auditory coherence for categorical perception.
    • Speech listeners reliably judged patterns as speech, similar to the synthetic syllables used for modeling.
    • Results support the hypothesis that speech perception relies on recognizing articulatory origins.

    Conclusions:

    • Speech coherence is not solely based on general auditory principles.
    • Listeners perceive phonetic coherence by recognizing acoustic patterns linked to articulatory movements.
    • The ability to perceive speech coherence is specific to speech processing, not general auditory perception.