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PubMed Central
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Nonlocal interactions in color perception: nonlinear processing of chromatic signals from remote inducers.
Wachtler T, Albright TD, Sejnowski TJ.
Howard
Hughes Medical Institute, The Salk Institute for Biological Studies, La
Jolla, CA 92037, USA. wachtler@biologie.uni-freiburg.de
The
perceived color of an object depends on the chromaticity of its
immediate background. But color appearance is also influenced by remote
chromaticities. To quantify these influences, the effects of remote
color fields on the appearance of a fixated 2 degrees test field were
measured using a forced-choice method. Changes in the appearance of the
test field were induced by chromaticity changes of the background and
of 2 degrees color fields not adjacent to the test field. The
appearance changes induced by the color of the background corresponded
to a fraction of between 0.5 and 0.95 of the cone contrast of the
background change, depending on the observer. The magnitude of
induction by the background color was modulated on average by 7.6% by
chromaticity changes in the remote color fields. Chromaticity changes
in the remote fields had virtually no inducing effect when they
occurred without a change in background color. The spatial range of
these chromatic interactions extended over at least 10 degrees from the
fovea. They were established within the first few hundred milliseconds
after the change of background color and depended only weakly on the
number of inducing fields. These results may be interpreted as
reflecting rapid chromatic interactions that support robustness of
color vision under changing viewing conditions.
PMID: 11343720 [PubMed - indexed for MEDLINE]
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