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The Journal of Neuroscience, September 15, 2001, 21(18):7313-7322

Intrasaccadic Perception

Miguel A. García-Pérez1 and Eli Peli2

1 Departamento de Metodología, Facultad de Psicología, Universidad Complutense, 28223 Madrid, Spain, and 2 The Schepens Eye Research Institute, Harvard Medical School, Boston, Massachusetts 02114

Mammalian vision has a lowpass frequency characteristic that filters out fast temporal oscillations. Thus, fast-drifting gratings cannot be detected with static eyes, but the same gratings can easily be detected by executing saccades. Because these gratings are invisible under fixation, they are useful for isolating and studying intrasaccadic perception, which is normally masked by presaccadic and postsaccadic perception. We have conducted a number of psychophysical studies using these stimuli, and here we report that intrasaccadic visual processing allows for motion perception, that gratings drifting in the direction of a saccade are perceived as having more contrast than the same gratings drifting in the opposite direction, and that intrasaccadic contrast perception has sufficient grain to allow psychophysical matching of the perceived contrast of gratings drifting in opposite directions. The conditions in which these phenomena occur disprove a recent hypothesis that intrasaccadic motion perception occurs for stimuli processed by the magnocellular system, and our results can be explained by assuming that the temporal lowpass characteristic that accounts for flicker fusion phenomena under vision with static eyes is also operative during saccades.

Key words: saccades; saccadic suppression; intrasaccadic perception; image motion; human; temporal impulse response

Copyright © 2001 Society for Neuroscience  0270-6474/01/21187313-10$05.00/0


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