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Temporal window of integration in auditory-visual speech perception.

Virginie van Wassenhove1, Ken W Grant, David Poeppel

  • 1Department of Psychology, University of California at Los Angeles, CA 90095, USA. vvw@caltech.edu

Neuropsychologia
|March 15, 2006
PubMed
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This study on auditory visual speech perception found that the McGurk effect, a fusion of sounds and lip movements, is most robust within a specific temporal window. This temporal integration window is asymmetric, favoring auditory lags.

Area of Science:

  • Auditory perception
  • Visual perception
  • Speech processing
  • Psychophysics

Background:

  • Auditory visual (AV) speech perception involves integrating auditory and visual speech cues.
  • The McGurk effect demonstrates illusory percepts when auditory and visual speech information is incongruent.
  • Temporal coincidence is crucial for effective audiovisual speech integration.

Purpose of the Study:

  • To investigate the temporal window of integration for audiovisual speech perception.
  • To examine the influence of temporal asynchrony on McGurk effect fusion responses.
  • To compare temporal characteristics of simultaneity judgments and fusion perception.

Main Methods:

  • Two experiments were conducted with 43 normal-hearing participants.

Related Experiment Videos

  • Experiment 1 used an identification task with varying temporal asynchronies (-467 ms to +467 ms) for McGurk stimuli.
  • Experiment 2 involved simultaneity judgments for congruent and incongruent AV speech tokens.

    • Main Results:

    • Fusion responses for McGurk pairs were prevalent between -30 ms and +170 ms temporal asynchronies.
    • Fusion was more robust for auditory lags (audio presented after visual).
    • McGurk pairs were judged as asynchronous more readily than congruent pairs, indicating a temporal integration window.

    Conclusions:

    • A 200 ms duration asymmetric bimodal temporal integration window exists for audiovisual speech perception.
    • The temporal characteristics for maximal simultaneity and fusion are similar.
    • Temporal factors significantly shape audiovisual speech perception and the McGurk effect.