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Perceptual localization of visual stimuli flashed during saccades
Perception & Psychophysics
|February 1, 1989
Summary
During a saccade (eye movement), visual targets are mislocalized. Perceptual location shifts with saccade direction, influenced by retinal position and eye movement signals.
Area of Science:
- Neuroscience
- Vision Science
- Perception
Background:
- Understanding visual perception during eye movements is crucial for explaining how the brain constructs a stable visual world.
- Saccades, rapid eye movements, present a challenge to visual stability, yet perception remains relatively seamless.
Purpose of the Study:
- To investigate how the perceived location of a visual target is affected when it is presented during a primary saccade.
- To explore the role of extraretinal eye position signals in visual localization during saccades.
Main Methods:
- Participants performed a saccade to a visual target presented during a primary saccade in darkness.
- They reported the apparent target position by adjusting a light spot.
Main Results:
- Targets presented early in the saccade were mislocalized in the saccade direction.
- Targets presented late in the saccade were mislocalized in the opposite direction.
- Perceptual localization was primarily driven by retinal position but showed a consistent shift towards the saccade direction.
Conclusions:
- Visual target localization during saccades is influenced by both retinal input and extraretinal eye position signals.
- The oculomotor system's localization ability can be imprecise, leading to discrepancies between perceptual and motor localization.
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