Abstract

We confirm a remarkable but forgotten property of human color vision that was described over 50 years ago by Tyndall [ J. Opt. Soc. Am. 23, 12 ( 1933)]: if wavelength discrimination is measured in the region of 455 nm, the sensitivity of the eye improves when a large fraction of the monochromatic light in each half of the matching field is replaced by white light that is common to the two halves. We demonstrate that a similar facilitation also occurs when the shortwave monochromatic components are held constant in luminance and a long-wave desaturant of increasing luminance is added to the shortwave discrimanda. We relate these phenomena to the properties of postreceptoral visual channels.

© 1988 Optical Society of America

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