In color theory and perceptual practice, two color naming combinations are forbidden-reddish greens and bluish yellows-however, when multicolored images are stabilized on the retina, their borders fade and filling-in mechanisms can create forbidden colors. The sole report of such events found that only some observers saw forbidden colors, while others saw illusory multicolored patterns. We found that when colors were equiluminant, subjects saw reddish greens, bluish yellows, or a multistable spatial color exchange (an entirely novel perceptual phenomena); when the colors were nonequiluminant, subjects saw spurious pattern formation. To make sense of color opponency violations, we created a soft-wired model of cortical color opponency (based on winner-take-all competition) whose opponency can be disabled.

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathenng and maintaining the data needed, and completing and reviewing the collection of information. 12b. DISTRIBUTION CODE ABSTRACT (Maximum 200 words)The eyepiece lenses of ANVIS night vision goggle are ostensibly adjusted for optimum visual acuity (VA). Many users however do not adjust the eyepieces competently. This paper examines whether a single-focus eyepiece is capable of producing satisfactory VA while maintaining comfortable vision over extended periods. In a short-term ANVIS wear study, a range of eyepiece focus produced comparable VA independent of luminance and contrast. The single best-overall eyepiece focus produced vision equal to, or better than, that of subject-adjusted eyepieces, producing VA within 2% of optimal. However, zero diopter eyepieces reduced VA by 10%. In a long-term ANVIS wear study, -1.5 diopter eyepieces caused half of the subjects to complain of blurred or uncomfortable vision. These studies indicate -0.75 diopter eyepieces provide opticallycorrected ANVIS users with near optimal binocular VA and satisfactory visual comfort during extended ANVIS use.