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Related Experiment Videos

The interaction between binocular rivalry and negative afterimages.

Lee A Gilroy1, Randolph Blake

  • 1Vanderbilt Vision Research Center, Department of Psychology, Vanderbilt University, Nashville, TN 37203, USA. lee.gilroy@vanderbilt.edu

Current Biology : CB
|October 11, 2005
PubMed
Summary

Negative afterimages (AIs) can form even when the inducing stimulus is suppressed, suggesting postretinal involvement. However, suppressed stimuli produce weaker AIs, indicating susceptibility to interocular suppression.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • Afterimage formation is traditionally linked to retinal processes.
  • Emerging evidence suggests postretinal mechanisms may also contribute to afterimage (AI) generation.
  • Binocular rivalry offers a paradigm to investigate the neural locus of visual processing, including AI formation.

Purpose of the Study:

  • To investigate the role of postretinal mechanisms in negative afterimage (AI) formation.
  • To examine the interaction between binocular rivalry and AI induction.
  • To determine if interocular suppression affects AI strength and characteristics.

Main Methods:

  • Experiments involved inducing negative afterimages using gratings under conditions of binocular rivalry.

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  • Stimuli were presented to one eye while suppressed in rivalry to investigate AI formation during non-conscious perception.
  • AI strength and orientation were measured, comparing suppressed versus visible stimulus conditions.

    • Main Results:

    • Vivid negative afterimages were generated even by stimuli suppressed during binocular rivalry.
    • Afterimages induced by suppressed stimuli were significantly weaker than those induced by visible stimuli.
    • Surprisingly, afterimages from suppressed stimuli initially dominated rivalry when presented dichoptically with afterimages from dominant stimuli.

    Conclusions:

    • Negative afterimage formation involves postretinal mechanisms susceptible to interocular suppression.
    • The findings challenge purely retinal explanations of afterimage generation.
    • Differential neural adaptation is proposed as a potential explanation for the counterintuitive dominance of afterimages from suppressed stimuli.