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Updated: Jun 13, 2026
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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
Published on: March 18, 2019
The influence of the consistency of postsaccadic visual errors on saccadic adaptation
Katharina Havermann1, Markus Lappe
1Psychologisches Institut II, Otto Creutzfeldt Center for Cognitive and Behavioral Neuroscience, Münster, Germany. k.havermann@uni-muenster.de
Journal of Neurophysiology
|April 16, 2010
Summary
Saccadic adaptation adjusts eye movements based on visual errors. This study found that consistent errors lead to stronger saccadic adaptation, while variable errors weaken it, optimizing motor control.
Area of Science:
- Neuroscience
- Motor Control
- Vision Science
Background:
- The saccadic system controls eye movements without constant visual feedback, making it vulnerable to disturbances.
- Saccadic adaptation allows adjustments to eye movements in response to anatomical or external changes.
- Error reliability is crucial for optimizing motor control systems.
Purpose of the Study:
- To investigate how the consistency of visual errors influences saccadic adaptation.
- To determine if saccadic adaptation considers error variability in addition to average error size.
Main Methods:
- A modified saccadic adaptation paradigm was used, specifying constant error sizes.
- Intrasaccadic target step sizes were calculated relative to predicted saccade landing positions.
- Visual error consistency was manipulated by adding varying levels of noise to target steps.
Main Results:
- Saccadic adaptation was strongest when visual errors were consistent across trials.
- Adaptation strength decreased as the variability (noise) in the visual error increased.
- This effect was observed across conditions with positive, negative, and clamped mean error distributions.
Conclusions:
- Saccadic adaptation mechanisms are sensitive to the consistency of visual errors, not just the average error magnitude.
- The reliability and consistency of sensory feedback play a significant role in refining motor commands for eye movements.
