Wenderoth P
Perception. 1981;10(6):605-14. doi: 10.1068/p100605.
It has been observed previously in the classic Poggendorff illusion figure that the end of the oblique line which abuts onto the vertical parallel appears more misaligned than its free end. Various theories suggest that angular distortions are largest at the point of abutment. Two experiments are reported which, however, suggest that, compared to displays in which a single dot is aligned with an oblique line, the introduction of a second, parallel oblique segment does not increase errors more at the abutting tip than at the free end, but, rather, reduces them more at the free end. These results not only cast doubt on the relative importance of angular effects alone in the classic Poggendorff display, but also emphasise the complexity of that figure as a tool in the investigation of visual processing.
此前在经典的波根多夫错觉图形中观察到，与垂直平行线邻接的斜线末端看起来比其自由端的错位更大。各种理论表明，角度扭曲在邻接处最大。然而，本文报道的两项实验表明，与单个点与斜线对齐的显示相比，引入第二条平行斜线段在邻接端比在自由端不会增加更多误差，反而在自由端减少的误差更多。这些结果不仅对角度效应在经典波根多夫显示中单独的相对重要性提出了质疑，也强调了该图形作为视觉处理研究工具的复杂性。
