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Smooth pursuit eye movements: is perceived motion necessary?
Science (New York, N.Y.)
|March 30, 1979
Summary
Perceived motion can trigger smooth pursuit eye movements. However, experiments show that actual retinal motion, not just perceived motion, is always required to guide these eye movements.
Area of Science:
- Neuroscience
- Vision Science
- Ophthalmology
Background:
- Recent studies indicate perceived motion alone can initiate smooth pursuit eye movements.
- This finding raises questions about the necessity of actual retinal motion for pursuit initiation.
Purpose of the Study:
- To determine if perceived motion is a necessary stimulus for smooth pursuit eye movements.
- To investigate the role of retinal motion versus perceived motion in controlling pursuit.
Main Methods:
- Three experiments were conducted to test the hypothesis.
- Stimuli were designed to dissociate perceived motion from retinal motion.
Main Results:
- Perceived motion was not sufficient to elicit pursuit when retinal motion was absent.
- Retinal motion consistently governed the generation of smooth pursuit eye movements across all experiments.
Conclusions:
- Actual retinal motion, not perceived motion, is the essential driver for smooth pursuit.
- These findings clarify the sensory requirements for initiating and guiding eye movements during visual tracking.