1 Also known as perceptual constancy.

2 Seminal works on constancy include “Brightness Constancy and the Nature of Achromatic Colors” by Hans Wallach, Journal of Experimental Psychology, 1948, vol. 38, p. 310–324; and “Determinants of Apparent Visual Size With Distance Variant” by A. F. Holway and Edwin G. Boring, American Journal of Psychology, 1941, vol. 54, p. 21–37. A nice review of the various forms of constancy is found in Sensation and Perception by Margaret W. Matlin and Hugh J. Foley, 4th ed., Allyn & Bacon, 1997.

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