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 Resjournal_title
Vision researchauthors
Kramer P,Bressan Pdoi
10.1016/j.visres.2009.11.004subject
Has Abstractpub_date
2010-01-01 00:00:00pages
144-8issue
2eissn
0042-6989issn
1878-5646pii
S0042-6989(09)00505-7journal_volume
50pub_type
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