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C Liu, RF Hess, Y-Z Wang; Luminance Spatial Scale and Local Stereopsis . Invest. Ophthalmol. Vis. Sci. 2002;43(13):4675.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To investigate the effects of spatial frequency, overall contrast energy and overall stimulus size on normal stereo-sensitivity. Methods: Stereo-sensitivity thresholds (Dmin) was measured using a 1 interval, 2AFC, method of constant stimuli, in which an area of fractal noise was presented in front or behind the fixation plane. The spatial frequency characteristics of the noise were varied using ideal lowpass or high pass filters. Results: Dmin is affected by lowpass filtering but not by highpass filtering, suggesting a possible spatial-frequency/disparity correlation. This was confirmed by obtaining an identical result using filtered images adjusted for equal overall energy. By using stimulus patches of different sizes we show that this spatial frequency/disparity correlation extends over the entire spatial frequency range that could be represented by our stimuli. Conclusion: Dmin exhibits a spatial frequency/disparity correlation extending from at least 0.5 c/deg to at least 10c/deg, consistent with there being multiple spatial channels capable of encoding stereopsis across this range.
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