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Three-dimensional shape perception from chromatic orientation flows

Published online by Cambridge University Press:  06 September 2006

QASIM ZAIDI
Affiliation:
SUNY College of Optometry, Department of Vision Sciences, New York, New York
ANDREA LI
Affiliation:
Queens College, CUNY, Department of Psychology, Flushing, New York

Abstract

The role of chromatic information in 3-D shape perception is controversial. We resolve this controversy by showing that chromatic orientation flows are sufficient for accurate perception of 3-D shape. Chromatic flows required less cone contrast to convey shape than did achromatic flows, thus ruling out luminance artifacts as a problem. Luminance artifacts were also ruled out by a protanope's inability to see 3-D shape from chromatic flows. Since chromatic orientation flows can only be extracted from retinal images by neurons that are responsive to color modulations and selective for orientation, the psychophysical results also resolve the controversy over the existence of such neurons. In addition, we show that identification of 3-D shapes from chromatic flows can be masked by luminance modulations, indicating that it is subserved by orientation-tuned neurons sensitive to both chromatic and luminance modulations.

Information

Type
SURFACE COLOR PERCEPTION
Copyright
© 2006 Cambridge University Press

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