Stereoscopic depth processing in the visual cortex: a coarse-to-fine mechanism
| Autor: | Ralph D. Freeman, Michael D. Menz |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
genetic structures
media_common.quotation_subject Models Neurological Action Potentials Synaptic Transmission Stereoscopic depth Perception Neural Pathways Reaction Time medicine Animals Computer vision Binocular neurons Visual Cortex media_common Neurons Depth Perception Communication business.industry General Neuroscience Neurophysiology Coarse to fine Visual cortex medicine.anatomical_structure Synapses Time course Cats Binocular disparity Artificial intelligence Nerve Net Psychology business Neuroscience Photic Stimulation |
| Zdroj: | Nature Neuroscience. 6:59-65 |
| ISSN: | 1546-1726 1097-6256 |
| DOI: | 10.1038/nn986 |
| Popis: | For binocular animals viewing a three-dimensional scene, the left and right eyes receive slightly different information, and the brain uses this 'binocular disparity' to interpret stereoscopic depth. An important theoretical conjecture in this mechanism is that coarse processing precedes and constrains finely detailed processing. We present three types of neurophysiological data from the cat's visual cortex that are consistent with a temporal coarse-to-fine tuning of disparity information. First, the disparity tuning of cortical cells generally sharpened during the time course of response. Second, cells responsive to large and small spatial scale had relatively shorter and longer temporal latencies, respectively. Third, cross-correlation analysis between simultaneously recorded pairs of cortical cells showed that connections between disparity-tuned neurons were generally stronger for coarse-to-fine processing than for fine-to-coarse processing. These results are consistent with theoretical and behavioral studies and suggest that rapid, coarse percepts are refined over time in stereoscopic depth perception. |
| Databáze: | OpenAIRE |
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