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Updated: Dec 12, 2025

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Scintillating Grid Illusion Without the Grid.

Toyomi Matsuno1

  • 1Faculty of Economics, Hosei University, Tokyo, Japan.

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|August 13, 2020
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Summary
This summary is machine-generated.

The scintillating grid illusion can occur without grid bars, challenging previous theories. Illusory spots depend on patch contour shape, suggesting peripheral vision processing limitations.

Keywords:
scintillating grid illusionspatial visionsurface filling-invisual illusion

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Area of Science:

  • Visual perception
  • Illusory phenomena
  • Peripheral vision

Background:

  • The scintillating grid illusion involves illusory black spots at grid intersections.
  • Previous theories assumed grid bars are essential for this visual illusion.

Purpose of the Study:

  • To investigate the scintillating grid illusion without grid bars.
  • To determine the factors influencing illusory percepts in a modified grid pattern.

Main Methods:

  • Two experiments were conducted using stimulus patterns lacking grid bars.
  • Perceptual properties of the illusion were systematically analyzed.

Main Results:

  • Illusory spots were perceived even without grid bars.
  • Illusion strength correlated with the contour shape of patch components.
  • Density and spatial alignment of patches had minimal impact on the illusion.

Conclusions:

  • Grid bars are not essential for the scintillating grid illusion.
  • The illusion may stem from limited processing of patch stimuli in peripheral vision.
  • Grid patterns may enhance the illusion by interfering with visual processing.