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The effects of auditory streaming on duplex perception.

V Ciocca, A S Bregman

    Perception & Psychophysics
    |July 1, 1989
    PubMed
    Summary

    Duplex perception, where one sound is heard as both a speech syllable and a chirp, is affected by auditory streaming. Presenting capturing transitions weakened the phonetic perception of the syllable.

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    Area of Science:

    • Psychoacoustics
    • Auditory Perception
    • Speech Processing

    Background:

    • Duplex perception involves simultaneous perception of a syllable and a chirp when auditory cues are presented to separate ears.
    • Previous research suggested independent phonetic and auditory processing modes.
    • The perceived syllable identity depends on the formant transition, even when the syllable base remains constant.

    Purpose of the Study:

    • To investigate the influence of auditory streaming on duplex perception.
    • To examine whether auditory and phonetic processes operate independently during duplex perception.
    • To test the hypothesis that conflicting cues affect the integration of auditory information.

    Main Methods:

    • Listeners identified and discriminated duplex syllables under various conditions.
    • An auditory streaming procedure embedded isolated transitions within a sequence of capturing transitions.
    • The effect of temporal sequencing on the perception of dichotic auditory stimuli was analyzed.

    Main Results:

    • Auditory streaming significantly weakened the contribution of the transition to the perceived phonetic identity of the syllable.
    • The 'capturing effect' suggests that sequential integration impacts the fusion of contralateral auditory information.
    • This finding challenges the notion of strictly independent auditory and phonetic processing.

    Conclusions:

    • Duplex perception may not solely rely on independent auditory and phonetic systems.
    • Conflicting cues for auditory segregation and integration appear crucial for duplex perception.
    • The findings support a more integrated model of auditory and phonetic processing.

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