Variations on the Hermann Grid: An Extinction Illusion
@article{Ninio2000VariationsOT, title={Variations on the Hermann Grid: An Extinction Illusion}, author={Jacques Ninio and Kent A. Stevens}, journal={Perception}, year={2000}, volume={29}, pages={1209 - 1217} }
When the white disks in a scintillating grid are reduced in size, and outlined in black, they tend to disappear. One sees only a few of them at a time, in clusters which move erratically on the page. Where they are not seen, the grey alleys seem to be continuous, generating grey crossings that are not actually present. Some black sparkling can be seen at those crossings where no disk is seen. The illusion also works in reverse contrast.
23 Citations
In honour of Lothar Spillmann - filling-in, wiggly lines, adaptation, and aftereffects.
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Two cases, known as the Extinction illusion and the Honeycomb illusion, involving small disks and lines, respectively, presented over a large extent of the visual field are studied, finding a dissociation between the two illusions in the dependence on contrast polarity suggesting different mechanisms.
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- BiologyPerception
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An alternative theory is proposed according to which the illusory effect is brought about by the manner in which S1 type simple cells in primary visual cortex respond to the grid, which adequately handles many of the facts delineated in this paper.
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The results suggest that the illusory spots of the scintillating grid illusion could be induced by the limited processing of the patch stimuli in the peripheral vision and that the grid could play a supplementary role by enhancing the effect by further interfering with the processing.
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The Honeycomb illusion complements previous related observations in suggesting that this representation of the environment is not necessarily based on multiple fixations or on extrapolation from information available to central vision.
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The main cause of the Hermann grid illusion is the straightness of the edges of the grid lines, and a theory is proposed which explains why the illusory spots occur in the original Hermann Grid and why they disappear in curved grids.
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It is shown that the blanking phenomenon is sensitive to the orientation of the line segments, while the weaker obscuring of dark targets is not, and possible reasons why white tetragons may be less effective than black tetragon under the authors' conditions are considered.
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- Physics
- 2001
In a periodic pattern of horizontally and vertically aligned quadrangles, two sets of illusory lines are seen to pulsate at orthogonal orientations, corresponding to the directions of knight's moves…
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