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Perception can influence the vergence responses associated with open-loop gaze shifts in 3D
Boris M Sheliga1, Frederick A Miles
1Laboratory of Sensorimotor Research, National Eye Institute, Bethesda, MD, USA. bms@lsr.nei.nih.gov
Journal of Vision
|February 10, 2004
Summary
Perceived depth, not just binocular disparity, can drive vergence eye movements. Manipulating perceived slant altered eye vergence during gaze shifts, even when horizontal disparity remained constant.
Area of Science:
- Vision science
- Oculomotor control
- Perception
Background:
- Binocular disparity is a primary cue for depth perception and drives vergence eye movements.
- The induced size effect demonstrates that perceived slant can occur without horizontal disparity gradients.
Purpose of the Study:
- To investigate whether perceived depth, independent of binocular disparity, can elicit vergence eye movements.
- To quantify the contribution of perceived depth to vergence during open-loop gaze shifts.
Main Methods:
- Utilized vertical image compression/expansion to manipulate perceived slant of a flat surface.
- Executed horizontal gaze shifts across the manipulated surface with images extinguished (open-loop).
- Measured vergence eye movements in response to perceived slant variations.
Main Results:
- Vergence eye movements accompanied horizontal gaze shifts, aligning with perceived slant direction, despite absent horizontal disparity gradients.
- Reducing perceived slant (via vertical compression) decreased vergence, while increasing perceived slant (via vertical expansion) increased vergence.
- Perceived depth contributed 15-41% to vergence, varying with experimental conditions.
Conclusions:
- Perceived depth is a significant factor in eliciting vergence eye movements, operating independently of binocular disparity.
- These findings challenge traditional models solely reliant on disparity for vergence control.
- The oculomotor system integrates perceived depth cues for accurate gaze control.