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Annu. Rev. Neurosci. 2002. 25:33979 doi: 10.1146/annurev.neuro.25.112701.142900
 

Summary: Annu. Rev. Neurosci. 2002. 25:33979
doi: 10.1146/annurev.neuro.25.112701.142900
Copyright c 2002 by Annual Reviews. All rights reserved
CONTEXTUAL INFLUENCES ON
VISUAL PROCESSING
Thomas D. Albright and Gene R. Stoner
Howard Hughes Medical Institute, Systems Neurobiology Laboratories, The Salk Institute
for Biological Studies, La Jolla, California 92037; email: tom@salk.edu; gene@salk.edu
Key Words occlusion, depth-ordering, figure-ground interpretation, filling-in,
visual cortex
s Abstract The visual image formed on the retina represents an amalgam of vi-
sual scene properties, including the reflectances of surfaces, their relative positions,
and the type of illumination. The challenge facing the visual system is to extract the
"meaning" of the image by decomposing it into its environmental causes. For each
local region of the image, that extraction of meaning is only possible if informa-
tion from other regions is taken into account. Of particular importance is a set of
image cues revealing surface occlusion and/or lighting conditions. These information-
rich cues direct the perceptual interpretation of other more ambiguous image regions.
This context-dependent transformation from image to perception has profound--but
frequently under-appreciated--implications for neurophysiological studies of visual

  

Source: Albright, Tom - Vision Center Laboratory, Salk Institute for Biological Studies

 

Collections: Biology and Medicine