Wertheimer-Koffka Ring


	As the two sides of the rectangle are pulled apart, one side of the center ring appears to be darker than the other. This is a 'light contrast' effect caused by lateral inhibition of photoreceptors in the retina. See how this effect changes with varying distance and gray levels.


	Contributed by: Rob Morris

Max Wertheimer and his two assistants, Wolfgang Köhler and Kurt Koffka, studied perception at the Psychological Institute of Frankfurt University in the early 1900s. Their work lead to the development of the field of Gestalt psychology.

K. Koffka, Principles of Gestalt Psychology, London: Lund Humphries, 1935.

"Wertheimer-Koffka Ring" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/WertheimerKoffkaRing/

Contributed by: Rob Morris

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