FIGURE 3.

The time course of the change in pupil size averaged across participants for two measurement time points, baseline and process. For each measurement point two pupillary light reflexes (PLRs) are elicited through presenting a bright stimulus on a dark background at 0 and 5 s, respectively. Upon presentation of the bright stimulus, the pupils constrict and re-dilate after reaching their respective minimum. An algorithm identifies the two minima and calculates the change from baseline to process pupil diameter.