Abstract
The pupillary light response reflects eye-movement preparation
Highlights
When the eyes are exposed to an increased influx of light, the pupils constrict
When you prepare a saccadic eye movement towards a stimulus, a pupillary light response (PLR) to that stimulus’ brightness is prepared already before the eyes set in motion, during preparation of the saccade itself
Off-line verification of timing, based on a trigger that was sent to the eye tracker immediately after the display change, showed that the display change occurred 27.09 ms (SD = 3.906) after saccade onset and 27.55 ms (SD = 7.852) before saccade offset
Summary
When the eyes are exposed to an increased influx of light, the pupils constrict. The pupillary light response (PLR) is traditionally believed to be purely reflexive and not susceptible to cognitive influences. The pupil constricted when attention was directed to the bright, as compared to the dark side of the display This showed that a PLR is elicited by a covertly attended stimulus, even when eye position and visual input are controlled for. Saccadic eye movements are preceded by covert shifts of attention (Deubel & Schneider, 1996; Kowler et al, 1995), and covert shifts of attention elicit a PLR (Binda et al, 2013a; Mathôt et al, 2013; Naber et al, 2013) We combine these findings and show that a PLR is prepared simultaneously with the preparation of a saccade towards a bright (or dark) stimulus
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