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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
Published on: August 1, 2018
Sensitivity to direction and orientation of random dot stereobars in the monkey visual cortex
Francisco Gonzalez1, Maria C Romero, Adrian F Castro
1Department of Physiology, School of Medicine, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain. francisco.gonzalez@usc.es
The European Journal of Neuroscience
|April 21, 2007
Summary
Neurons in the monkey visual cortex can detect the orientation and movement direction of stereoscopic bars, similar to how they process objects with defined edges. This suggests a key role for binocular vision in perceiving 3D structure.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Visual Perception
Background:
- Objects with contrast-defined edges allow perception of movement and orientation.
- Stereobars, created from random dot stereograms, can be perceived even without contrast-defined edges.
Purpose of the Study:
- To investigate the orientation and direction selectivity of disparity-sensitive cells in response to both luminance-defined and stereo-defined bars.
- To compare the sensitivity of these cells to luminance versus stereoscopic stimuli.
Main Methods:
- Recorded from 207 disparity-sensitive cells in visual areas V1 and V2 of Macaca mulatta monkeys.
- Utilized luminance-defined bars and random-dot stereo-defined bars during an attentive fixation task.
Main Results:
- A significant relationship was found between orientation and direction preferences for luminance bars and stereobars (r=0.83 for direction, r=0.63 for orientation).
- Disparity-sensitive cells showed greater sensitivity to luminance than to stereobars for orientation and movement direction.
- Cells in V1 and V2 demonstrated similar detection capabilities for both luminance-defined and stereo-defined bars.
Conclusions:
- Cells in V1 and V2 of the monkey visual cortex can detect the orientation and direction of movement of stereobars, akin to luminance-defined bars.
- This capability relies on the comparison of input from the left and right eyes, crucial for stereoscopic perception.
