Figure 3.

ON-OFF contrast–response functions of an example human subject (same subject as in Fig. 2b). a, Percentage of all errors, including missed targets (i.e., the target is present, but the subject signals that there is no target) and mislocated targets (e.g., the target appears on the left hemifield but the subject signals a target in right hemifield). From left to right, the figure shows the ON-OFF contrast response function averaged across all tested eccentricities (5–30°) and at specific eccentricity ranges (5–10°, 15–20°, and 25–30°), measured separately for dark (blue) and light targets (red). b, Same as a for missed targets. c, Same as a for reaction time.