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Temporal recalibration during asynchronous audiovisual speech perception.

Argiro Vatakis1, Jordi Navarra, Salvador Soto-Faraco

  • 1Crossmodal Research Laboratory, Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford, OX1 3UD, UK. argiro.vatakis@psy.ox.ac.uk

Experimental Brain Research
|April 14, 2007
PubMed
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Monitoring asynchronous speech alters temporal perception. Adapting to delayed auditory speech shifts the perceived timing of simultaneous audiovisual speech, impacting complex speech perception.

Area of Science:

  • Auditory perception
  • Audiovisual speech processing
  • Temporal order judgment

Background:

  • The brain integrates auditory and visual speech information for coherent perception.
  • Adaptation to audiovisual speech stimuli can alter subsequent perceptual judgments.
  • Previous research demonstrated adaptation effects with simple audiovisual stimuli.

Purpose of the Study:

  • To investigate if adapting to asynchronous audiovisual speech affects temporal perception of complex speech.
  • To determine the impact of monitoring a continuous asynchronous speech stream on temporal order judgments (TOJs) of simultaneous speech.

Main Methods:

  • Participants performed TOJ tasks on vowel-consonant-vowel (VCV) audiovisual speech clips.
  • Half the participants simultaneously monitored a continuous, asynchronous audiovisual speech stream.

Related Experiment Videos

  • The continuous stream was presented either in synchrony or with a 300 ms auditory lag.

    • Main Results:

    • Monitoring an asynchronous speech stream caused a significant 13 ms shift in the point of subjective simultaneity.
    • This shift occurred in the direction of the adapting stimulus, indicating altered temporal perception.
    • The effect was observed even when processing complex VCV speech stimuli.

    Conclusions:

    • Adaptation to asynchronous speech has broader consequences than previously shown for simple stimuli.
    • The perception of complex audiovisual speech, like VCVs, is susceptible to adaptation effects from continuous speech streams.
    • This suggests robust mechanisms for audiovisual speech adaptation influencing temporal timing perception.