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|Title:||Hierarchy of spatial interactions in the processing of contrast-defined contours|
|Citation:||Journal of the Optical Society of America A-Optics Image Science and Vision, 2001; 18(9):2190-2196|
|Publisher:||Optical Soc Amer|
|Peter Wenderoth, Colin W. G. Clifford, and Anna Ma Wyatt|
|Abstract:||Both psychophysical and neurophysiological evidence suggest that there are two visual cortical processing streams, a linear stream that processes first-order stimuli and a nonlinear stream that also processes second-order stimuli. This evidence also suggests that before the extraction of the second-order signal, the nonlinear pathway broadly but not completely pools signals across initial linear filters that encode the orientation of the carrier of the second-order signal. The evidence suggests that such pooling does not occur across carrier spatial frequencies. We show that similar results are obtained with repulsion tilt illusions but not with attraction effects. Attraction effects exhibit complete orientation crossover (while retaining spatial frequency selectivity), perhaps indicating higher-level processing; an experiment on interocular transfer of the effects supported this conclusion.|
|Keywords:||Visual Cortex; Humans; Illusions; Orientation; Mental Processes; Form Perception; Space Perception; Visual Perception; Contrast Sensitivity; Posture; Ocular Physiological Phenomena|
|Rights:||Copyright © 2001 Optical Society of America|
|Appears in Collections:||Psychology publications|
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