错觉图形组成成分间的亮度对比和颜色对比对错觉程度的影响

EFFECTS OF LUMINANCE CONTRAST AND COLOR CONTRAST BETWEEN COMPONENTS OF ILLUSORY FIGURE ON THE ILLUSION MAGNITUDE

用定量的心理物理测量方法,研究了错觉图形组成成分间的亮度对比和颜色对比对方位错觉(Zoellner错觉)、长度错觉(Muller-Lyer错觉和Ponzo错觉)及面积错觉(Delboeuf错觉)幅度的影响。测试结果表明:与通常的错觉效应相比,当错觉图形组成成分间存在亮度对比或颜色对比(等亮度)时,受试者的错觉程度明显降低;其中,当存在颜色对比时,方位错觉的下降幅度更为显著,达到69.3％。此外还观察到,在单纯亮度对比条件下,只需1.8％和5.3％的低对比度即可分别产生轮廓和边缘错觉;但在等亮度颜色对比时这种错觉完全消失;而且,当存在颜色对比时,即使把错觉图形与背景间不同颜色的对比度增加到46.4％和66.0％,仍不能产生明显的边缘和轮廓错觉。这些实验结果提示:在视觉系统中,传递长度、大小、方位和边缘等图形特征的视觉通道与传递亮度和颜色特征的视觉通道之间可能存在着相互抑制作用。

Using quantitative psychophysical measurements, the effects of luminance contrast(LC) and equiluminance color contrast (ECC) between components of illusory figureson the magnitudes of orientation illusion (Zoellner illusion), length illusion (Muller-Lyer illusion and Ponzo illusion) and area illusion (Delboeuf illusion) were investigated.The results showed that, compared with normal illusory magnitude, the illusory magni-tude of the subjects decreased obviously when LC or ECC existed between the compo-nents of the illusory figures. The decrease was especially obvious in the orientation illu-sion. The minimum contrasts for inducing contour and border illusions were only1.8% and 5.3% under LC. They increased to 66.0% and 46.4% respectively whenboth luminance and color contrasts were introduced into the figures. These observationsprovided evidence for the existence of mutual inhibition between the luminance, colorand form channels of the visual system.