Abstract

The hue, saturation, and brightness of a field of white light were varied by the simultaneous chromatic stimulation of neighboring retinal areas. Visual sensitivity was measured by determining the threshold luminance of chromatic test stimuli presented as increments upon these background fields. The spatial position of the test stimulus was varied within the central field of induced color. Chromatic-contrast effects extending over relatively large retinal areas may be maintained by a mechanism operating at a different level of the visual system than that at which increment sensitivity is determined. The data are discussed in relation to the explanation of chromatic contrast based upon selective lateral adaptation and the concept of opponent-response induction.

© 1970 Optical Society of America

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