Kitaoka A, Ishihara M
Department of Behavioral Physiology, Tokyo Metropolitan Institute for Neuroscience, Tokyo.
Percept Psychophys. 2000 Apr;62(3):569-75. doi: 10.3758/bf03212108.
We have discovered an apparent contraction illusion of acute angles in a special form of the Zöllner figure at the intersecting angles between 36 degrees and 83 degrees (i.e., a reversal of the Zöllner illusion). The necessary condition for this illusion is that inducing lines are long enough and the induced line (test line) is single. When an illusory line is used as the induced line, the magnitude of contraction increases. Short inducing lines give no illusion or a slight expansion of acute angles at the intersecting angle of 45 degrees. We have ascertained that the source of this expansion is the narrow region in the vicinity of the induced line, whereas the source of the contraction is much broader regions. Furthermore, we have discovered another expansion mechanism, which is generated by the symmetrical configuration of the standard Zöllner figure.
我们在一种特殊形式的佐尔纳图形中发现了锐角的明显收缩错觉，该图形的相交角度在36度至83度之间（即佐尔纳错觉的反转）。产生这种错觉的必要条件是诱导线足够长且诱导线（测试线）为单条。当使用虚幻线作为诱导线时，收缩幅度会增加。短的诱导线不会产生错觉，或者在45度相交角处会使锐角略有扩张。我们已经确定这种扩张的来源是诱导线附近的狭窄区域，而收缩的来源则是更宽的区域。此外，我们还发现了另一种扩张机制，它是由标准佐尔纳图形的对称结构产生的。
