Figure 5.

Effect of background luminance on pupil velocity responses related to saccade preparation. (A) Pupil velocity dynamics following the instructed fixation cue in different saccade preparation conditions between the dark and bright background. (B) Peak pupil constriction velocity in different saccade preparation conditions with dark and bright backgrounds. In (A), the shaded colored regions surrounding the pupillary response curves represent the ± standard error range (across participants) for different conditions. In (B), the large-circle and error-bars represent the mean values ± standard error across participants. The small circles represent mean value for each participant. *Indicates differences are statistically significant.