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Related Experiment Videos

Visual motion aftereffects: critical adaptation and test conditions

N J Wade1, L Spillmann, M T Swanston

  • 1Department of Psychology, University of Dundee, Scotland. n.j.wade@dundee.ac.uk

Vision Research
|July 1, 1996
PubMed
Summary

The visual motion aftereffect (MAE) occurs when adapting specific retinal areas to motion. This effect is only observable when both adapted and non-adapted regions are tested simultaneously.

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Area of Science:

  • Visual perception
  • Neuroscience
  • Psychophysics

Background:

  • The visual motion aftereffect (MAE) is a phenomenon where stationary objects appear to move after exposure to visual motion.
  • Induced motion, where surrounding moving elements cause a stationary central element to appear to move, can also generate MAE.
  • Previous research indicated limited MAE in surrounding gratings after induced motion adaptation.

Purpose of the Study:

  • To investigate the specific stimulus conditions required for generating the MAE from induced motion.
  • To determine how adaptation and testing conditions influence the occurrence and strength of MAE in central and surrounding gratings.

Main Methods:

  • Five experiments were conducted using stationary and moving gratings to induce and test for MAE.

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  • Adaptation involved exposing specific retinal regions to motion (surround or center).
  • Testing involved presenting stationary gratings to assess MAE in central and/or surround regions.

    • Main Results:

    • A central MAE was observed when testing stationary center and surround gratings after adapting only the surround.
    • No MAE was measurable when testing only the center or only the surround.
    • Maximum central MAE occurred when the adapted and tested surround region were identical.
    • MAE duration depended on the surround's spatial frequency, not the center's.
    • MAE was observable in surround gratings when they were surrounded by stationary gratings during testing.

    Conclusions:

    • The linear MAE results from adapting restricted retinal areas to motion.
    • MAE expression requires the simultaneous testing of both adapted and non-adapted retinal regions.
    • The findings clarify the conditions under which MAE can be generated and perceived, particularly in induced motion scenarios.