摘要: Abstract We have measured threshold disparity as a function of the spatial frequency (0.25–20 c/deg) and contrast (0.02–0.75) sine-wave gratings. In forced-choice trials, subjects indicated whether target grating had crossed or uncrossed relative to reference grating. Thresholds were lowest near 3 c/deg rose in proportion period at lower frequencies. Above c/deg, there marked individual differences. Across range frequencies, sensitivity correlated (r = 0.84). Threshold was inversely proportional square root contrast. When seen by one eye reduced producing unequal monocular contrasts, more than when two eyes same amount. Our results implications for stereo models that use zero crossings, peaks troughs, centroids matching primitives. These can account decline low sapatial frequencies but only peak model satisfactorily accounts effect If limiting sources noise are highly correlated, be accounted using differential-amplifier principle.
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