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. 2022 Aug 12;17(8):e0271881. doi: 10.1371/journal.pone.0271881

Fig 3. Disparity sensitivity function curve with letter charts.

Fig 3

a) DSF curve from the pilot study in Experiment 1 using a staircase method on a haploscope. The blue line represents the log parabola quadratic fit from the results of five subjects, while the color markers are individual results. The DSF curve with letter stimuli had a U-shape, in accordance with results from sinusoidal gratings in the literature. The dark blue ‘X” indicates the estimated peak of disparity sensitivity. b) The DSF curve for near, far, crossed, and uncrossed conditions in Experiment 2 using Method of Constant Stimuli. The far DSF curve (solid lines) is higher than the near conditions, indicating a superior stereopsis at far than near. The DSF curve for the crossed disparity is also higher than uncrossed disparity for both far and near, implying higher sensitivity for crossed disparity (front). The 95% confidence bounds, shaded regions were calculated with bootstrap resampling (1000 repeats).