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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

The role of local framework luminance range in the simultaneous lightness contrast illusion with double increments