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Delboeuf illusion

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File:Delboeuf.jpg

The Delboeuf illusion is an optical illusion of relative size perception. In the best-known version of the illusion, two circles of identical size have been placed near to each other and one is surrounded by an annulus; the surrounded circle then appears larger than the non-surrounded circle if the annulus is close, while appearing smaller than the non-surrounded circle if the annulus is distant. A 2005 study suggests it is caused by the same visual processes that cause the Ebbinghaus illusion.[1]

EponymEdit

It was named for the Belgian Philosopher, Mathematician, Experimental Psychologist, Hypnotist and Psychophysicist, Joseph Remi Leopold Delboeuf (1831 – 1896), who created it sometime in 1887 – 1888.

ReferencesEdit

  1. Roberts B, Harris MG, Yates TA. (2005). The roles of inducer size and distance in the Ebbinghaus illusion (Titchener circles). Perception 34 (7): 847–56.


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