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Updated: Aug 8, 2026
09:49
Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
Published on: April 16, 2014
Intrasaccadic perception
1Departamento de Metodologia, Facultad de Psicologia, Universidad Complutense, 28223 Madrid, Spain. miguel@psi.ucm.es
Summary
Intrasaccadic visual processing during eye movements enables motion perception. Gratings drifting with saccades appear more contrasted, revealing insights into visual processing during saccades.
Area of Science:
- Neuroscience
- Vision Science
- Perception
Background:
- Mammalian vision exhibits a lowpass frequency characteristic, filtering rapid temporal oscillations.
- Fast-drifting gratings are undetectable with static eyes but perceivable during saccadic eye movements.
- Fast-drifting gratings, invisible during fixation, serve to isolate intrasaccadic perception.
Purpose of the Study:
- To investigate intrasaccadic visual processing capabilities.
- To determine if motion perception occurs during saccades.
- To examine the influence of saccade direction on perceived contrast.
Main Methods:
- Conducted psychophysical studies using fast-drifting gratings.
- Utilized gratings invisible under fixation to isolate intrasaccadic perception.
- Employed psychophysical matching to compare perceived contrast.
Main Results:
- Intrasaccadic visual processing supports motion perception.
- Gratings drifting in the saccade direction are perceived with higher contrast.
- Intrasaccadic contrast perception allows for matching of gratings drifting in opposite directions.
- Results challenge the magnocellular system hypothesis for intrasaccadic motion perception.
Conclusions:
- The temporal lowpass characteristic of vision operates during saccades.
- Intrasaccadic perception is influenced by saccade direction and temporal filtering.
- These findings provide a new understanding of visual processing during eye movements.
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