The appearance of targets consisting of central disks of one color surrounded by annuli of another color were investigated under conditions such that the inner edge of the annulus (i.e., the boundary between the two colors) was stabilized but the outer boundary was not. The luminance of the annulus was held constant while the luminance of the disk was varied from trial to trial to produce contrasts above and below equality. It was found that the central disk disappeared intermittently. When this occurred, the whole target, disk and annulus, appeared homogeneous in color, the color being that of the annulus.
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