Independence of brown induction and brightness induction

[摘要] Both brightness and brownness are induced by high-contrast articulated surrounds, in White's illusion, a checkerboard variation, and a set of concentric rings. Overall, brightness assimilation and brown assimilation were observed more frequently than contrast, but the frequencies differ across surround stimuli. The frequency of assimilation was similar for brightness and brown induction with rings and checkerboards, but not with White's illusion. The direction of brightness and brown induction was independent with White's illusion, but more observers showed congruent direction of induction than expected with rings and checkerboards. When individual observers show congruent direction of effects, brown induction tends to be weaker than brightness induction (regardless of direction). Thus, brightness and brown induction are set apart by the likely direction of effect for different stimuli, the degree of congruence for each stimulus, and the amount of induction for each stimulus.

[学科分类] 眼科学