(NAS Colloquium) Vision From Photon to Perception (1999) / Chapter Skim
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Binocular visual surface perception
Binocular visual surface perception
Pages 78-83
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From page 78... ...
Cortical area V2 receives afferents from V1 in a highly organized manner, such that its subdivisions receive inputs from differing classes of cells in cortical V1 (1, 2~. Psychophysical investigations in human observers provided parallel evidence for the existence of such orientation and spatial frequency units in the human cortex.
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From page 79... ...
We have hypothesized elsewhere that when such unbounded regions face each other, they can be part of a single surface, which is completed behind an occluder. That stereoscopic depth plays a decisive role in dictating both border ownership and surface linkage can be appreciated by fusing the stereoscopic images shown in Fig.
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From page 80... ...
Viewed ordinarily (not as a stereogram) , the two portions of the red ellipse can be perceived either as separate red fragments of a tiled mosaic pattern or, alternatively, as described earlier, a single larger figure completing behind.
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From page 81... ...
. By fusing the stereogram in b, which has exactly the same disparity relations but differing luminance values, we no longer see transparency but fragments of a black ellipse in front of a smaller red ellipse behind (see illustration in d)
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From page 82... ...
(c) Top view of a transparent surface seen against a black surface, which in turn is seen against a bright white background, thus creating conditions of strong back but weak front illumination.
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From page 83... ...
Here, because of the well-known ocular dominance structure of V1 (1) , it is clear that there exist neurons that respond differentially to which eye received visual stimulation.
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