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Related Experiment Videos

Afterimages, grating induction and illusory phantoms.

J G May1, J M Brown, S Roberts

  • 1Department of Psychology, University of New Orleans, LA 70148-2870, USA.

Vision Research
|February 9, 2000
PubMed
Summary

Illusory gratings predominantly appear out-of-phase, regardless of inspection area luminance. Afterimages can bias judgments in stationary displays but not drifting ones, suggesting attention influences perception.

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Area of Science:

  • Visual perception
  • Psychophysics
  • Computational neuroscience

Background:

  • Illusory gratings can appear in- or out-of-phase depending on inspection area conditions.
  • Previous research indicated only out-of-phase illusory gratings, but methodology might have introduced afterimage bias.

Purpose of the Study:

  • To investigate the potential bias of afterimages on illusory grating perception.
  • To determine the phase relationship of illusory gratings under varying conditions.

Main Methods:

  • Experiments involved inducing afterimages using brief flashes or stimulus shifts with stationary or drifting gratings.
  • Subjects judged the phase relationship (in- or out-of-phase) of illusory gratings.

Main Results:

Related Experiment Videos

  • Out-of-phase illusory gratings were predominant across all experiments.
  • Afterimages biased judgments only with stationary displays, not with drifting displays.

Conclusions:

  • Afterimages can influence illusory grating perception, particularly in static stimuli.
  • Attention to local contrast versus global stimulus aspects may differentiate grating induction from phantom visibility.