Abstract:The speed of processes underlying lightness constancy was studied by having observers discriminate small differences in simulated lightness under an oscillating illumination. The period of oscillation varied from 0.25 to 120 sec. The target was a 1º square which appeared for 150 msec at random intervals either directly against a uniform background or separated from the background by a 1º dark gap. When the target and background were adjacent to each other, discrimination accuracy approached control levels (fix… Show more
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