Abstract

Although reduced luminance impairs the discrimination of small disparity stimuli, large-disparity discrimination may improve. For example, crossed and uncrossed stimulus disparities of 4° that are not discriminated at photopic levels may be easily discriminated at mesopic levels near the color threshold. This improvement of stereo processing appears to be dependent upon an effective contrast reduction produced neurally, because a physical reduction of contrast without a change of background luminance may also improve large-disparity stereopsis.

© 1974 Optical Society of America

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