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Related Experiment Videos

Limits on phonetic integration in duplex perception

D H Whalen1, A M Liberman

  • 1Haskins Laboratories, New Haven, Connecticut 06511-6695, USA. whalen@haskins.yale.edu

Perception & Psychophysics
|August 1, 1996
PubMed
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Listeners integrate distinct auditory signals into a single phonetic perception, even when signals originate from separate sources. This study explores the limits of this phonetic integration using auditory cues.

Area of Science:

  • Auditory Perception
  • Phonetics
  • Psychoacoustics

Background:

  • Listeners integrate acoustically separate sound sources into a unified phonetic percept.
  • Duplex perception allows hearing both a non-speech whistle and speech sounds simultaneously.
  • The integration of phonetic cues with other auditory information is not fully understood.

Purpose of the Study:

  • To investigate the boundaries of phonetic integration.
  • To determine how competing auditory signals affect the perception of speech sounds.
  • To explore the role of signal coherence in auditory perception.

Main Methods:

  • Experiments involved presenting listeners with a sinusoidal consonant cue (F3 transition for [da] vs. [ga]) alongside syllable resonances.
  • Manipulated auditory signals using precursors and simultaneous harmonics to test integration limits.

Related Experiment Videos

  • Measured the reduction in phonetic integration under different auditory conditions.

    • Main Results:

    • A precursor tone significantly reduced phonetic integration, suggesting 'capture' of the phonetic cue.
    • Simultaneous harmonics also reduced integration, but primarily by acting as distractors below the duplexity threshold.
    • The degree of capture by a precursor could be reduced when the precursor itself was part of a complex auditory pattern.

    Conclusions:

    • The phonetic system integrates signals based on their phonetic coherence, overriding purely auditory separation.
    • Auditory scene analysis and phonetic processing interact, with competing signals influencing perception.
    • The findings support a model where the phonetic system integrates information based on its internal cohesive power versus evidence of separate sources.