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Color and the Intensity-Time Relation

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Abstract

Measurements of the intensity necessary for monocular differential thresholds for red, green, and blue test lights were made at exposures of the test light ranging from 0.002 to 1.000 second. Central fixation was used, the colored test light appearing as a small dot brighter than the surrounding, white-lighted field. The adaptation brightness was just above the cone threshold. Adaptation was controlled over forty degrees of the visual field, including the very center. Three selected subjects, with normal color vision and acuity, contributed approximately one thousand threshold determinations. The method of limits was used. It was found that there were no differences among the critical durations for the three colors.

© 1952 Optical Society of America

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