The role of local framework luminance range in the simultaneous lightness contrast illusion with double increments
In double increment Simultaneous Lightness Contrast two equiluminant squares rest on darker backgrounds that differ in luminance. Research on such displays has produced conflicting results as to whether an illusion is observed. Anchoring theory of lightness predicts no illusion with double...
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| Format: | Article |
| Language: | English |
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Drustvo Psihologa Srbije
2015-01-01
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| Series: | Psihologija |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/0048-5705/2015/0048-57051502183E.pdf |
| Summary: | In double increment Simultaneous Lightness Contrast two equiluminant squares
rest on darker backgrounds that differ in luminance. Research on such
displays has produced conflicting results as to whether an illusion is
observed. Anchoring theory of lightness predicts no illusion with double
increment displays. Here we test the hypothesis that an illusion can be
predicted if the framework containing the target and the darkest background
carries more weight in lightness computations. We tested two displays, one
with a general white and one with a general black background. An illusion was
obtained only in the first display. These results suggest that an illusion
can occur with double increment displays when the global value of the targets
differs from their local value, as these conditions allow different local
framework weighting to affect the targets’ final lightness. We propose that
this parameter be added to the Anchoring Theory. |
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| ISSN: | 0048-5705 1451-9283 |