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| Volume 9, Number 3, Article 22, Pages 1-17 |
doi:10.1167/9.3.22 |
http://journalofvision.org/9/3/22/ |
ISSN 1534-7362 |
Spatial filtering versus anchoring accounts of
brightness/lightness perception in staircase and simultaneous brightness/lightness contrast stimuli
Barbara Blakeslee |
Center for Visual Neuroscience, Department of Psychology, North Dakota State University, Fargo, ND, USA |
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Daniel Reetz |
Center for Visual Neuroscience, Department of Psychology, North Dakota State University, Fargo, ND, USA |
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Mark E. McCourt |
Center for Visual Neuroscience, Department of Psychology, North Dakota State University, Fargo, ND, USA |
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Abstract
J. Cataliotti and A. Gilchrist ( 1995) reported that, consistent with anchoring theory, the lightness of a black step in a reflectance staircase was not altered by moving a white step from a remote to an adjacent location. Recently, E. Economou, S. Zdravkovic, and A. Gilchrist ( 2007) reported data supporting three additional predictions of the anchoring model (A. Gilchrist et al., 1999): 1) equiluminant incremental targets in staircase simultaneous lightness contrast stimuli appeared equally light; 2) the simultaneous lightness contrast effect was due mainly to the lightening of the target on the black surround; and 3) the strength of lightness induction was greatest for darker targets. We investigated similar stimuli using brightness/lightness matching and found, contrary to these reports, that: 1) the relative position of the steps in a luminance staircase significantly influenced their brightness/lightness; 2) equiluminant incremental targets in staircase simultaneous brightness/lightness contrast stimuli did not all appear equally bright/light; 3) an asymmetry due to a greater brightening/lightening of the target on the black surround was not general; and 4) darker targets produced larger effects only when plotted on a log scale. In addition, the ODOG model (B. Blakeslee & M. E. McCourt, 1999) did an excellent job of accounting for brightness/lightness matching in these stimuli.
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