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• W2059224519 abstract "Although the human visual system can accurately estimate the reflectance (or lightness) of surfaces under enormous variations in illumination, two equiluminant grey regions can be induced to appear quite different simply by placing a light-dark luminance transition between them. This illusion, the Craik-Cornsweet-O'Brien (CCOB) effect, has been taken as evidence for a low-level 'filling-in' mechanism subserving lightness perception. Here, we present evidence that the mechanism responsible for the CCOB effect operates not via propagation of a neural signal across space but by amplification of the low spatial frequency (SF) structure of the image. We develop a simple computational model that relies on the statistics of natural scenes actively to reconstruct the image that is most likely to have caused an observed series of responses across SF channels. This principle is tested psychophysically by deriving classification images (CIs) for subjects' discrimination of the contrast polarity of CCOB stimuli masked with noise. CIs resemble 'filled-in' stimuli; i.e. observers rely on portions of the stimuli that contain no information per se but that correspond closely to the reported perceptual completion. As predicted by the model, the filling-in process is contingent on the presence of appropriate low SF structure." @default.
• W2059224519 created "2016-06-24" @default.
• W2059224519 creator A5003910525 @default.
• W2059224519 creator A5019987116 @default.
• W2059224519 date "2003-11-22" @default.
• W2059224519 modified "2023-10-16" @default.
• W2059224519 title "Natural image statistics mediate brightness ‘filling in’" @default.
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• W2059224519 doi "https://doi.org/10.1098/rspb.2003.2528" @default.
• W2059224519 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1691518" @default.
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