Journal
NEUROIMAGE
Volume 30, Issue 1, Pages 228-238Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2005.09.067
Keywords
fMRI; depth; kinetic border; structure; human cortex
Funding
- NEI NIH HHS [EY 7890] Funding Source: Medline
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Functional MRI studies have identified a cortical region designated as KO between retinotopic areas V3A/B and motion area V5 in human cortex as particularly responsive to motion-defined or: kinetic borders. To determine the response of the KO region to more general aspects of structure, we used stereoscopic depth borders and disparate planes with no borders, together with three stimulus types that evoked no depth percept: luminance borders, line contours and illusory phase borders. Responses to these stimuli in the KO region were compared with the responses in retinotopically defined areas that have been variously associated with disparity processing in neurophysiological and fMRI studies. The strongest responses in the KO region were to stimuli evoking perceived depth structure from either disparity or motion cues, but it showed negligible responses either to luminancey stimuli. We conclude that based contour stimuli or to edgeless disparity the region designated as KO is best regarded as a primary center for the generic representation of depth structure rather than any kind of contour specificity. (c) 2005 Elsevier Inc. All rights reserved.
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