Intrasaccadic perception triggers pupillary constriction

PeerJ
Sebastiaan MathôtEric Castet

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...Continue Reading

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Citations

Jun 15, 2017·Psychological Science·Sebastiaan MathôtKristof Strijkers
Sep 18, 2018·Annual Review of Vision Science·Paola Binda, Maria Concetta Morrone
Jan 14, 2018·Behavior Research Methods·Sebastiaan MathôtStefan Van der Stigchel
Jan 9, 2016·Journal of Neurophysiology·Alessandro Benedetto, Paola Binda
Apr 26, 2020·Journal of Vision·Richard Schweitzer, Martin Rolfs
Nov 11, 2019·Behavior Research Methods·Richard Schweitzer, Martin Rolfs
May 21, 2020·Annual Review of Vision Science·Sebastiaan Mathôt
Sep 5, 2018·Scientific Reports·Christoph StrauchAnke Huckauf

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