Paradoxical lightness contrast.

Abstract:

:The visual system's computation of lightness (perceived reflectance) leads to contrast effects in which a gray target region appears lighter on a black background than on a white one. Here we show a paradoxical contrast effect in which targets look lighter after adding regions that increase the scene's average luminance, and darker after adding regions that decrease this luminance. The paradoxical effect emerges if the target sits either on a black local background surrounded by a white remote background, or on a white local background surrounded by a black remote background. It does not occur if both backgrounds have the same luminance. The effect is consistent with Bressan's double-anchoring theory, and likely also with those edge-integration theories that assume gain control, but differs from previously reported effects of assimilation, articulation, reverse contrast, and remote contrast.

journal_name

Vision Res

journal_title

Vision research

authors

Kramer P,Bressan P

doi

10.1016/j.visres.2009.11.004

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

144-8

issue

2

eissn

0042-6989

issn

1878-5646

pii

S0042-6989(09)00505-7

journal_volume

50

pub_type

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