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(A). Linear summation of two eyes' CM gratings with 90° out of phase when their carriers are anti-correlated. (B). Total contrast energy (TCE) normalized with the gain-control threshold when the contrast modulation (CM) depth is varied but the carrier contrast (CC) is fixed at 0.2 (blue) or when the CM depth is fixed at 0.7 but the CC is varied (red). The gain-control threshold is also indicated (black dashed line).
