Figure 4.

ON-OFF contrast-response functions of subject average. a–c, Contrast-response functions for darks (blue) and lights (red) calculated from the percentage of all errors (a), missed targets (b), and reaction times (c) at different eccentricity ranges. d, Average (left) and SDs (right) of pupil diameters measured in 34 subjects. In each subject, each pupil mean and SD was measured during the entire stimulus presentation, separately for each contrast. e, Same as d for horizontal (left) and vertical (right) eye position. f, Same as d for head yaw (left), pitch (middle), and roll (right). g, Time spent in each task session for each stimulus contrast. Error bars are standard error of means (SEM).