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[Effects of luminance contrast and color contrast between components of illusory figure on the illusion magnitude].

Using quantitative psychophysical measurements, the effects of luminance contrast (LC) and equiluminance color contrast (ECC) between components of illusory figures on the magnitudes of orientation illusion (Zoellner illusion), length illusion (Müller-Lyer illusion and Ponzo illusion) and area illusion (Delboeuf illusion) were investigated. The results showed that, compared with normal illusory magnitude, the illusory magnitude of the subjects decreased obviously when LC or ECC existed between the components of the illusory figures. The decrease was especially obvious in the orientation illusion. The minimum contrasts for inducing contour and border illusions were only 1.8% and 5.3% under LC. They increased to 66.0% and 46.4% respectively when both luminance and color contrasts were introduced into the figures. These observations provided evidence for the existence of mutual inhibition between the luminance, color and form channels of the visual system.