Wenderoth P, van der Zwan R
Department of Psychology, University of Sydney, NSW, Australia.
Percept Psychophys. 1991 Oct;50(4):321-32. doi: 10.3758/bf03212224.
One-dimensional (1-D) orientation illusions induced on a test grating by a tilted and surrounding 1-D inducing grating have a well-known angular function that exhibits both repulsion and attraction effects. Two-dimensional (2-D) orientation illusions are those induced on a test grating by 2-D image modulation, such as a pair of superimposed inducing gratings at different orientations, usually orthogonal (a plaid). Given the known angular functions induced by the plaid component gratings, two hypotheses were developed that predicted different plaid-induced illusion functions. Hypothesis 1 states that the 1-D component-induced effects simply add linearly; Hypothesis 2 states that there is an additional mechanism that responds to the virtual axes of mirror symmetry of the plaid and adds to the effect. The data of two experiments were consistent with the predictions from the second hypothesis but not the first. Possible neural substrates of mechanisms that extract axes of symmetry are discussed; it is suggested that such global symmetry axes may underlie the perceived orientation of complex shapes.
由倾斜且环绕的一维诱导光栅在测试光栅上产生的一维（1-D）方向错觉具有一个众所周知的角度函数，该函数表现出排斥和吸引效应。二维（2-D）方向错觉是指由二维图像调制在测试光栅上产生的错觉，例如一对不同方向（通常为正交，即一个格子图案）的叠加诱导光栅。鉴于格子图案组成光栅所产生的已知角度函数，提出了两种假设，它们预测了不同的格子图案诱导错觉函数。假设1指出，一维组成部分诱导的效应简单地线性相加；假设2指出，存在一种额外的机制，该机制对格子图案的镜面对称虚轴作出反应并增加效应。两个实验的数据与第二个假设的预测一致，而与第一个假设不一致。文中讨论了提取对称轴机制的可能神经基础；有人提出，这种全局对称轴可能是复杂形状感知方向的基础。
