图形简单几何特征的分辨及其相关错觉的定量研究

QUANTITATIVE STUDIES ON DISCRIMINATION OF SIMPLE GEOMETRIC PATTERNS AND RELATED VISUAL ILLUSONS

本实验用定量的心理物理测量方法,研究了在亮度对比与等亮度颜色对比的条件下,受试者分辨图形简单几何特征的能力以及与这些图形特征有关的错觉效应(Zoellner错觉、Muller-Ly-er错觉、Ponzo错觉和Delboeuf错觉)。实验结果表明:受试者在亮度对比与颜色对比的条件下对线段平行度、线段长度与图形面积的分辨能力相同,与这些几何特征有关的错觉幅度也没有显著差异。但是,在等亮度颜色对比条件下,受试者的轮廓与边缘错觉消失。此外,还观察到受试者产生方位(平行度)错觉所需的最低对比度较高(15％),而产生轮廓与边缘错觉所需的对比度则要低得多(1.8％和5.3％)。这些都提示图形简单几何特征和轮廓与边缘可能是由不同的视觉通道传递的。

Using quantitative psychophysical measurements, the abilities in discriminatingsome simple geometric patterns and the related visual illusions (Zoellner, Muller--Lyer,Ponzo and Delboeuf illusions) were investigated under luminance contrast (LC) and iso--luminance color contrast (ICC). The results showed that the subjects possessed identicalabilities in discriminating parallelity, length and area, and illusory distortion perceivedfor these geometric properties were of the same strength, no matter the figures were dis-played by LC or ICC. The contour- and border illusions, however, vanished at ICC.The minimum contrast inducing contour and border illusions (1.8% and 5.3%, re-spectively) was considerably lower than that inducing parallelity illusion (15%).Thase imply that simple geometric properties and contours (or borders) of visual imagesmay be separately transmitted by different visual pathways.