Abstract
The discoloration illusion, a new visual phenomenon, is
described. This phenomenon originates from the juxtaposition of eight
chromatic parallel contours on a white background, creating a luminance
gradient and enclosing a light red region. Under these conditions, the
inner region appears white: the light red discolors and appears white with
both surface color and luminous qualities. In two experiments, the
discoloration illusion was (i) compared with the coloration effect of the
watercolor illusion, obtained when the number of adjacent contours was
reduced to at least two, and (ii) tested under several conditions useful
for understanding the roles of the luminance gradient profile. The results
suggest that discoloration is not a lightness illusion and does not depend
on simultaneous contrast or on achromatic mechanisms, but more likely on
chromatic mechanisms that, through the luminance chromatic gradient,
provide cues about the interactions of light and surface and model the
volume by depicting lights and shades. The discoloration illusion suggests
a possible neural scenario where multiple juxtaposed contours may
stimulate neurons, selective for different asymmetric luminance profiles
and signaling not only the unilateral belongingness of the boundaries and
the coloration effect but also the volumetric and the illumination
effects.
Publisher
Cambridge University Press (CUP)
Subject
Sensory Systems,Physiology
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