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Ambivalence in modelling oblique saccades.
1Ocular Motor Neurophysiology Laboratory, Veterans Administration Medical Center, Cleveland, OH.
Biological Cybernetics
|January 1, 1988
Summary
The Cartesian theory of human oblique saccades, involving independent generators, can replicate the polar coordinate model. This suggests existing evidence does not definitively support the polar model, and further research is needed.
Area of Science:
- Neuroscience
- Ophthalmology
- Biomechanics
Background:
- Human oblique saccades are eye movements that can be explained by two main theories: the Cartesian theory (independent vertical and horizontal generators) and the polar coordinate theory (central coding of amplitude and angle).
- Existing experimental evidence has been interpreted to support the polar coordinate theory.
Purpose of the Study:
- To investigate the validity of the polar coordinate theory for human oblique saccades.
- To determine if a Cartesian model can account for observed saccade behaviors.
Main Methods:
- A computational Cartesian model was developed with cross-coupled vertical and horizontal pulse generators.
- The model was simulated to generate oblique saccades and compared to predictions of the polar coordinate model.
Main Results:
- The cross-coupled Cartesian model successfully produced saccade patterns that were identical to those described by the polar coordinate model.
- This demonstrates that the observed saccade behavior does not exclusively support the polar coordinate theory.
Conclusions:
- The experimental evidence cited in favor of the polar coordinate theory is not conclusive.
- The variability and contradictory nature of oblique saccade data across studies and species suggest that current models may be premature.
- Further research is required to understand the complex central organization of oblique saccades.