I2).Ĭraik-Cornsweet illusion See Craik-O'Brien-Cornsweet effect.ĭelboeuf illusion Illusion in which a circle surrounded by a slightly larger concentric circle appears larger than another circle of the same size surrounded by a much larger concentric circle (Fig. The figure that seems further away appears larger than the one in the foreground (Fig. A variant of this illusion consists of hollow squares without alternating colour and is called a 'hollow square illusion'.Ĭornsweet illusion See Craik-O'Brien-Cornsweet effect.Ĭorridor illusion Illusion in which images of equal size in a perspective figure of a corridor, appear to be of different sizes. Illusion in which a dot placed halfway between a large disc and a smaller disc appears to be nearer the large one.Ĭafé wall illusion An illusion induced by a pattern of alternating columns of black and white rectangles (or squares) placed in such a way that the lines that they compose do not appear to be parallel. Illusion in which a line connecting two large squares appears shorter than a line connecting two smaller squares (Fig. It is not due to eye movements and the illusion disappears as soon as the ambient luminance increases so that other objects become visible. See ambiguous figure.Īutokinetic visual illusion The apparent motion of a luminous object fixated in the dark, or in a large blank field. Illusions can occur with each of the senses. A false interpretation of an object or figure presented to the eye ( visual illusion).
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