August 2014
Volume 14, Issue 10
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2014
The pupillary light response reflects eye-movement preparation
Author Affiliations
  • Sebastiaan Mathôt
    Laboratoire de Psychologie, CNRS, Aix-Marseille Université
  • Lotje van der Linden
    Laboratoire de Psychologie, CNRS, Aix-Marseille Université
  • Grainger Jonathan
    Laboratoire de Psychologie, CNRS, Aix-Marseille Université
  • Françoise Vitu
    Laboratoire de Psychologie, CNRS, Aix-Marseille Université
Journal of Vision August 2014, Vol.14, 203. doi:10.1167/14.10.203
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Sebastiaan Mathôt, Lotje van der Linden, Grainger Jonathan, Françoise Vitu; The pupillary light response reflects eye-movement preparation. Journal of Vision 2014;14(10):203. doi: 10.1167/14.10.203.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

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. In contrast to this traditional view, we report here that the PLR is initiated during the preparation of an eye movement towards a bright (or dark) stimulus, even before the eyes set in motion. Participants fixated a central gray area and made a saccadic eye movement towards a peripheral target. Using gaze-contingent display changes, we manipulated whether or not the brightness of the target was the same during and after eye-movement preparation. More specifically, on some trials we changed the brightness of the target as soon as the eyes set in motion, thus dissociating the preparatory PLR (i.e. to the target brightness during saccade preparation) from the 'regular' PLR (i.e. to the target brightness after the saccade). We show that a preparatory PLR is initiated during saccade preparation, approximately 100 ms before saccade onset. This preparatory response allows the pupil to track luminance changes in visual input more rapidly than would be possible without preparation. Strikingly, a purely preparatory luminance-related pupillary response was triggered even when a saccade was prepared towards a bright (or dark) stimulus that was removed before being brought into central vision. We link our findings to the pre-saccadic shift of attention: The pupil adjusts its size to the brightness of a to-be-fixated stimulus, as soon as attention shifts towards the target of an upcoming saccade. Our findings illustrate that the PLR is a dynamic movement that is tightly linked to visual attention and eye-movement preparation.

Meeting abstract presented at VSS 2014

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×