Journal
NEURON
Volume 47, Issue 1, Pages 155-166Publisher
CELL PRESS
DOI: 10.1016/j.neuron.2005.05.028
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Funding
- NEI NIH HHS [R01 EY002966, EY-02966] Funding Source: Medline
- NINDS NIH HHS [P01 NS038034, NS-38034] Funding Source: Medline
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Figure-ground organization is a process by which the visual system identifies some image regions as foreground and others as background, inferring 3D layout from 2D displays. A recent study reported that edge responses of neurons in area V2 are selective for side-of-figure, suggesting that figure-ground organization is encoded in the contour signals (border ownership coding). Here, we show that area V2 combines two strategies of computation, one that exploits binocular stereoscopic information for the definition of local depth order, and another that exploits the global configuration of contours (Gestalt factors). These are combined in single neurons so that the near side of the preferred 3D edge generally coincides with the preferred side-of-figure in 2D displays. Thus, area V2 represents the borders of 2D figures as edges of surfaces, as if the figures were objects in 3D space. Even in 3D displays, Gestalt factors influence the responses and can enhance or null the stereoscopic depth information.
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