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Revealing perceptual grain with patterned stimulation. In two subjects at three eccentricities, cone and gap thresholds were measured when 2, 3, or 5 cones were stimulated simultaneously, again with interleaved trials. In all cases, cone thresholds were significantly lower than gap thresholds (p ≤ 0.01). Numbers indicate mean threshold values ±1 SD from five repeated runs. Light delivery contours derived as in Figure 2.
