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Subjectively, we observed that, by looking at a particular patch through both filters simultaneously (i.e., Filter 1 over the left eye, Filter 2 over the right), a color percept is observed that is different from the color perceived through either filter individually or with no filter. This new percept may be a manifestation of the approximatelyfoureffectiveconetypescreatedbythepairoffilters. Wenotethatarelatedstudyinvolving dichromats demonstrated an increase in color dimensionality using band-pass filters, which the authors suggest the effect could be related to binocular lustre16. Our proposed capability to distinguish metamers by breaking binocular redundancy may be affected by binocular lustre and/or rivalry, which might be advantageous provided it can be used as a cue to a difference in hue. For example, a recent report has demonstrated that compression artifacts of pixels in virtual reality images can be easily detected due to 26 27–29 lustre .Notethatlustreandrivalryarebothdynamicphenomena,evenforstaticstimuli ;thustheuse of lustre/rivalry may result in a tradeoff between temporal and spectral resolution. Though our current experiments do not directly investigate the effect of lustre or rivalry, or probe to what degree the neuronal processing system of a trichromat can take advantage of the extra spectral information resulting from binocular filtering, this can be explored in future work. We note that substantial differences in luminance between the two eyes, such as for spectra that transmit chiefly through only one filter, might lead to the Pulfrich effect30; however, our design was optimized to minimize differences in appearance of Illuminant D65, and the binocular luminance disparity required for the Pulfrich effect to occur is unlikely for most commonly occurring (i.e., smooth/broad) spectra. 8PDF Image | Enhancing color vision by breaking binocular redundancy
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