Document Detail

The orientation dependence of the Hermann grid illusion.
MedLine Citation:
PMID:  14610627     Owner:  NLM     Status:  MEDLINE    
The Hermann grid illusion (HGI), elicited by a grid displayed as either horizontal-vertical (HV) or oblique (45 degrees ) configuration, was measured as the luminance necessary to cancel the illusory spots at the grid intersections. Overall, the HGI produced by the oblique grid was about one-third of that produced by the HV grid. The observers exhibited different sensitivities to the HGI orientation, and seemed to perceive the illusion in two manners: with moderate anisotropy (reduction of about 20%, three subjects) or large anisotropy (90% reduction, four subjects). The quantitative reduction of the HGI elicited by the oblique pattern tested and its reduction to almost zero in some subjects, constitute a benchmark for any model aimed at explaining the HGI on psychophysical grounds.
Victor De Lafuente; Octavio Ruiz
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Publication Detail:
Type:  Journal Article     Date:  2003-11-11
Journal Detail:
Title:  Experimental brain research     Volume:  154     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2003-12-19     Completed Date:  2004-05-03     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  255-60     Citation Subset:  IM    
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MeSH Terms
Contrast Sensitivity / physiology
Illusions / physiology*
Models, Neurological
Observer Variation
Orientation / physiology*
Pattern Recognition, Visual / physiology*
Photic Stimulation
Space Perception / physiology*
Visual Fields / physiology*

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