ON-OFF eccentricity–response functions of subject average. a–c, Eccentricity–response functions for darks (blue) and lights (red) calculated from the percentage of all errors (a), missed targets (b), and reaction times (c). 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 eccentricity range. 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, Response time spent for each stimulus eccentricity averaged across all stimulus targets and subjects. Error bars are SEM.