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Related Experiment Videos

Temporal ventriloquism: sound modulates the flash-lag effect.

Jean Vroomen1, Beatrice de Gelder, Jean Vroomen

  • 1Department of Psychology, Tilburg University, Tilburg, Netherlands. j.vroomen@uvt.nl

Journal of Experimental Psychology. Human Perception and Performance
|May 27, 2004
PubMed
Summary

Auditory stimuli can influence visual perception. A synchronized sound reduced the flash-lag effect (FLE), demonstrating temporal ventriloquism and altering visual timing.

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Area of Science:

  • Psychology
  • Neuroscience
  • Perception

Background:

  • The flash-lag effect (FLE) is a visual illusion where a moving object appears to lag behind a simultaneously flashed object.
  • Temporal ventriloquism describes how auditory stimuli can alter the perceived timing of visual events.

Purpose of the Study:

  • To investigate the influence of auditory stimuli on the flash-lag effect (FLE).
  • To demonstrate temporal ventriloquism within the context of the FLE.

Main Methods:

  • Experiment 1: Compared FLE magnitude and variability with and without a synchronized noise burst.
  • Experiment 2: Varied the temporal delay of a sound relative to a flash and measured the resulting FLE.

Main Results:

Related Experiment Videos

  • A synchronized noise burst significantly reduced the magnitude and variability of the FLE.
  • The size of the FLE changed linearly with the temporal delay of the sound relative to the flash.

    • Conclusions:

    • An isolated sound can sharpen the temporal perception of a visual flash.
    • Auditory stimuli can attract the perceived temporal occurrence of visual events, demonstrating temporal ventriloquism.