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Induced steady color shifts from temporally varying surrounds

Published online by Cambridge University Press:  06 September 2006

ANTHONY D. D'ANTONA  and
STEVEN K. SHEVELL
ANTHONY D. D'ANTONA
Affiliation:
Department of Psychology, University of Chicago, Chicago, Illinois
STEVEN K. SHEVELL
Affiliation:
Department of Psychology, University of Chicago, Chicago, Illinois Department of Opthalmology and Visual Science, University of Chicago, Chicago, Illinois
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Abstract

The color appearance of a physically steady central region can appear to vary over time if a surrounding chromatic light varies in time. The induced temporal variation, however, is strongly attenuated at surround temporal frequencies above ∼3 Hz. At these higher temporal frequencies, the central region appears steady (De Valois et al., 1986). The posited explanation is a cortical low-pass temporal filter. Here, we investigate whether higher temporal-frequency surrounds induce color shifts in the steady appearance of the central test. Surrounds modulated in time along the l or s chromatic direction of MacLeod-Boynton color space were symmetric around equal-energy white (EEW). The temporal frequency of the surround was varied. If observers perceived the central test to be temporally modulating between two points in time, they set two separate matches to the extreme points of this modulation. If the central test appeared steady in time, then color matches were made to this steady appearance. Corroborating previous reports, measurements showed that surround temporal frequencies below ∼3 Hz induced temporal modulation. At higher temporal frequencies, however, the surround induced steady color shifts, compared to a steady surround at its time average (EEW). The measurements imply that a nonlinear neural process affects chromatic induction from time-varying context.

Keywords

Chromatic inductionTemporal processingTemporal integrationNonlinearity
Type
TEMPORAL FACTORS
Information
Visual Neuroscience , Volume 23 , Issue 3-4 , May 2006 , pp. 483 - 487
Copyright
© 2006 Cambridge University Press

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