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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
Published on: July 21, 2020
Depth-cue integration in grasp programming: no evidence for a binocular specialism.
Bruce D Keefe1, Paul B Hibbard2, Simon J Watt1
1School of Psychology, Bangor University, Wales, United Kingdom.
Neuropsychologia
|March 5, 2011
Summary
Grasping movements adjust the margin-for-error based on overall visual uncertainty, not specific binocular cues. The brain integrates multiple depth cues for improved grasping performance.
Area of Science:
- Neuroscience
- Vision Science
- Motor Control
Background:
- Grasping behavior often widens when using only one eye, suggesting binocular vision's critical role.
- Previous research is inconclusive on whether this reflects a specialized binocular grasp control or general cue integration.
Purpose of the Study:
- To investigate whether grasping control relies on specialized binocular cues or integrates multiple depth cues.
- To differentiate between a functional specialism for binocular vision and cue-integration theory in grasping.
Main Methods:
- Selective removal of monocular (texture) or binocular depth cues during visually open-loop grasping.
- Psychophysical measurement of size estimation uncertainty for each cue condition.
- Assessment of grip aperture changes in response to altered cue availability and uncertainty.
Main Results:
- Removing either monocular or binocular cues led to similar increases in grip apertures.
- Increased uncertainty, irrespective of cue type, also resulted in larger grip apertures.
- Grip apertures were smallest when both binocular and monocular cues were available.
Conclusions:
- Grasping adjustments are driven by overall uncertainty in size estimation, not the absence of specific binocular cues.
- Evidence supports cue-integration theory, showing the visuo-motor system benefits from redundant information.
- The study refutes a specialized role for binocular vision in grasp programming.
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