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Related Experiment Videos

Neon colour spreading in three-dimensional illusory objects in humans.

M Liinasuo1, I Kojo, J Häkkinen

  • 1Institute of Biomedicine, Department of Physiology, P.O. Box 9, 00014 University of Helsinki, Helsinki, Finland. marja.liinasuo@helsinki.fi

Neuroscience Letters
|March 8, 2000
PubMed
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Neon color spreading occurs in 3D illusory shapes, demonstrating that visual contour completion and surface filling-in processes interact across depth. This effect persists even when shapes are partially occluded.

Area of Science:

  • Visual Perception
  • Computational Neuroscience
  • Psychophysics

Background:

  • Illusory contours and surfaces are perceptual phenomena where the brain generates shapes not present in the stimulus.
  • Neon color spreading is a perceptual effect where a color appears to spread into an illusory surface.

Purpose of the Study:

  • To investigate if neon color spreading can be induced within three-dimensional (3D) illusory triangles.
  • To explore the interaction between neural contour completion and surface filling-in across different depths.

Main Methods:

  • Utilized Kanizsa triangles, formed by pacman disks with curved sectors.
  • Presented stimuli monocularly to create 2D illusory contours and surfaces.
  • Employed stereoscopic viewing to induce 3D perception of concavity or convexity.

Related Experiment Videos

Main Results:

  • Monocular viewing induced 2D illusory contours, surfaces, and neon spreading.
  • Stereoscopic viewing resulted in concave or convex illusory triangles.
  • Neon color spreading occurred within 3D illusory figures, even when occluded by an intervening surface.

Conclusions:

  • Neural contour completion and surface filling-in interact across depth.
  • Neon spreading can be induced in 3D illusory figures, supporting cross-depth interactions.
  • Perceptual transparency is crucial for maintaining illusory configurations behind occluding surfaces.