Intrasaccadic perception triggers pupillary constriction

Sebastiaan Mathot*, Jean-Baptiste Melmi, Eric Castet

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)
63 Downloads (Pure)

Abstract

It is commonly believed that vision is impaired during saccadic eye movements. However, here we report that some visual stimuli are clearly visible during saccades, and trigger a constriction of the eye's pupil. Participants viewed sinusoid gratings that changed polarity 150 times per second (every 6.67 ms). At this rate of flicker, the gratings were perceived as homogeneous surfaces while participants fixated. However, the flickering gratings contained ambiguous motion: rightward and leftward motion for vertical gratings; upward and downward motion for horizontal gratings. When participants made a saccade perpendicular to the gratings' orientation (e.g., a leftward saccade for a vertical grating), the eye's peak velocity matched the gratings' motion. As a result, the retinal image was approximately stable for a brief moment during the saccade, and this gave rise to an intrasaccadic percept: A normally invisible stimulus became visible when eye velocity was maximal. Our results confirm and extend previous studies by demonstrating intrasaccadic perception using a reflexive measure (pupillometry) that does not rely on subjective report. Our results further show that intrasaccadic perception affects all stages of visual processing, from the pupillary response to visual awareness.

Original languageEnglish
Article number1150
Number of pages16
JournalPeerJ
Volume3
DOIs
Publication statusPublished - 4-Aug-2015
Externally publishedYes

Keywords

  • Pupillometry
  • Intrasaccadic perception
  • Saccadic suppression
  • Eye movements
  • Experimental psychology
  • Vision science
  • SACCADIC EYE-MOVEMENTS
  • MOTION PERCEPTION
  • LIGHT REFLEX
  • SUPPRESSION
  • RESPONSES
  • STIMULUS
  • PATHWAY

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