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Related Experiment Videos

A model for inhibitory lateral interaction effects in perceived contrast

M W Cannon1, S C Fullenkamp

  • 1Armstrong Laboratory AL/CFHV, Wright-Patterson Air Force Base, OH 45433-7022, USA.

Vision Research
|April 1, 1996
PubMed
Summary

The apparent contrast of a central Gabor patch decreases when surrounded by flanking patches. A two-layer non-linear model accurately explains this contrast reduction in visual perception.

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Area of Science:

  • Visual perception
  • Computational neuroscience

Background:

  • Contrast perception is fundamental to visual processing.
  • Surrounding visual elements can influence the perceived contrast of a central target.

Purpose of the Study:

  • To investigate how flanking Gabor patches affect the apparent contrast of a central Gabor target.
  • To model the non-linear mechanisms underlying this contrast modulation.

Main Methods:

  • Contrast matching was used to measure apparent contrast.
  • Varying the number and radius of flanking patches and their contrasts.
  • Developing and testing a two-layer non-linear computational model.

Main Results:

  • Flanking patches consistently reduced the apparent contrast of the central target.

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  • The effect was dependent on the number and arrangement of flanking patches.
  • The proposed two-layer model showed good agreement with the experimental data.

    • Conclusions:

    • Lateral interactions significantly modulate contrast perception.
    • A two-layer non-linear model provides a viable framework for understanding contrast adaptation and surround effects.