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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 18, Iss. 9 — Sep. 1, 2001
  • pp: 2190–2196

Hierarchy of spatial interactions in the processing of contrast-defined contours

Peter Wenderoth, Colin W. G. Clifford, and Anna Ma Wyatt  »View Author Affiliations


JOSA A, Vol. 18, Issue 9, pp. 2190-2196 (2001)
http://dx.doi.org/10.1364/JOSAA.18.002190


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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.

© 2001 Optical Society of America

OCIS Codes
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6110) Vision, color, and visual optics : Spatial filtering
(330.7310) Vision, color, and visual optics : Vision

Citation
Peter Wenderoth, Colin W. G. Clifford, and Anna Ma Wyatt, "Hierarchy of spatial interactions in the processing of contrast-defined contours," J. Opt. Soc. Am. A 18, 2190-2196 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-9-2190


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