Figure 7.

Results of Experiment 2 for observer GJ. Binocularly equal-contrast contours obtained by comparing the contrast of a binocularly-combined sine-wave grating with the standard contrast that was always presented in the DE when the NDE/DE contrast ratio was 0, 0.125, 0.25, 0.5, 0.71, 1, 1.4, 2, 4, 8, or ∞. The contrast of a standard grating was 24% (first column) or 48% (second column), and its spatial frequency was 0.68 (top), 1.36 (middle), or 2.72 cpd (bottom). Two eyes' sine waves were in phase (blue circle) tested for all conditions or 90° out of phase (red star) tested only for 0.68 cpd and 48% contrast. The solid curve was the best fit from the DSKL model using the same model parameters for fitting data from Experiment 1.