The Gelb effect.

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Abstract
A spot of light was focused to coincide with the boundaries of a black rotating disk, thereby producing an appearance of grayish-white. Studied the effect of white contrasting stimuli of the same shape but of 3 different sizes suspended in front of the disk with the positions of those contrasting stimuli varied from the center of the disk to a location on the outside and tangent to the disk. Increase in size of the contrasting stimuli darkened the appearance of the disk. The greatest effect was obtained when the stimulus was in the center of the disk. Concluded that the Gelb phenomenon is a contrast-effect governed by the usual laws of lightness-contrast. 16 refs. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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