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Visual motion due to eye movements helps guide the hand.
David Whitney1, Melvyn A Goodale
1The Department of Psychology & The Center for Mind and Brain, The University of California, Davis, CA 95616, USA. dwhitney@ucdavis.edu
Experimental Brain Research
|January 18, 2005
Summary
Retinal motion during smooth pursuit eye movements influences visuomotor control. A moving background, even with stationary targets, alters reaching accuracy, indicating its use in guiding actions.
Area of Science:
- Neuroscience
- Visuomotor Control
- Perception
Background:
- Visuomotor control relies on integrating sensory information for accurate object localization.
- Retinal motion's utility is debated due to ambiguity with head/eye movements.
Purpose of the Study:
- To investigate the contribution of retinal motion during smooth pursuit eye movements to visuomotor control.
- To determine if the visuomotor system utilizes retinal motion information.
Main Methods:
- Subjects performed smooth pursuit eye movements while reaching to a remembered target.
- A moving or stationary background was introduced to manipulate retinal image motion (retinal slip).
- Reaching movement endpoints were analyzed to assess accuracy.
Main Results:
- A background moving with pursuit (no retinal slip) caused reaching overshoots.
- A stationary background (retinal slip opposite to pursuit) improved reaching accuracy.
- Retinal motion significantly altered reaching endpoints.
Conclusions:
- The visuomotor system actively uses background retinal motion during visually guided actions.
- Retinal motion provides crucial information for accurate visuomotor control, even during smooth pursuit.