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Task-dependent changes in the shape and thickness of Listing's plane
J F DeSouza1, D A Nicolle, T Vilis
1Neuroscience Program, University of Western Ontario, London, Canada.
Vision Research
|August 1, 1997
Summary
The 3D eye position surface deviates from Listing's plane, showing task-dependent twists and thickness variations during saccadic eye movements.
Area of Science:
- Neuroscience
- Ophthalmology
- Biomechanics
Background:
- Listing's law describes the 2D surface of eye positions during normal gaze.
- The precise geometry of this surface and its variations with different saccadic tasks are not fully understood.
Purpose of the Study:
- To investigate how the 2D surface of 3D eye positions changes with different saccadic directions.
- To determine if the shape and thickness of this surface are affected by task demands.
Main Methods:
- Analysis of 3D eye position data from normal subjects performing various saccadic tasks (random, horizontal, vertical, radial, clockwise, counter-clockwise).
- Examination of the resulting 2D surface for deviations from Listing's plane, including twist and thickness.
Main Results:
- Eye positions formed a surface with a small twist, deviating from Listing's plane even in random tasks.
- The degree of surface twist varied with saccadic task direction, being less for horizontal and more for vertical tasks.
- Surface thickness increased in multidirectional tasks, potentially due to the composite nature of these surfaces.
Conclusions:
- The 2D surface of eye positions is not a perfect plane and exhibits task-dependent torsional properties.
- Saccadic direction significantly influences the geometry of the eye position surface, impacting its twist and thickness.