Abstract：
:The purpose of this work is to describe how the visual system groups surfaces of unequal lightness under complex patterns of illumination. We propose that the Gestalt principle of Grouping by Regularity explains this process better than the more often cited principle of Grouping by Similarity. In our first experiment we demonstrate that in a perceptual organization task, pitting proximity against illumination gradients, discounting the illuminant was contingent upon the periodicity of the illuminant. Traditional theories of lightness constancy and discounting the illuminant (Rock, Nijhawan, Palmer, & Tudor, 1992) cannot account for such effects. Three more experiments show that grouping is affected more by local luminance ratios than constant reflectance ratios. We conclude from these findings that Grouping by Regularity is a powerful grouping principle that operates pre-constancy.
journal_name
Vision Resjournal_title
Vision researchauthors
van den Berg M,Kubovy M,Schirillo JAdoi
10.1016/j.visres.2011.04.013subject
Has Abstractpub_date
2011-06-21 00:00:00pages
1360-71issue
12eissn
0042-6989issn
1878-5646pii
S0042-6989(11)00155-6journal_volume
51pub_type
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