NEW CONFIGURATIONAL EFFECTS ON PERCEIVED CONTRAST AND BRIGHTNESS - 2ND-ORDER WHITES EFFECTS

Novel phenomena of perceived contrast and brightness in spatial config urations are presented, which are of the type used by White but consis t exclusively of contrast variations or of combined contrast and lumin ance variations. As with White's effect, perceived contrast and bright ness in these displays do not correspond to predictions based on low-l evel mechanisms of contrast and brightness induction, and it is sugges ted that spatial organisation influences the appearance of first-order and second-order stimuli in a similar fashion.