Wenderoth P, O'Connor T
Department of Psychology, University of Sydney, NSW, Australia.
Perception. 1987;16(1):79-88. doi: 10.1068/p160079.
When a solid (filled-in) triangle is mirror-reflected about its vertex such that one angle arm and its reflection form a straight edge, this straight edge appears as a chevron bent in the direction of the other sides of the triangles, an effect directionally opposite to the well-known tilt illusion that occurs with outline angles. It has been proposed that these negative solid-angle illusions (assimilation effects) which occur in dual-angle (Bourdon-type) displays result from a failure to discriminate between the test (judged) edges and the bisectors of the solid angles. In dual-angle outline displays, near-zero effects have been attributed to the availability of collinearity cues. These hypotheses were tested in two experiments in which cues to collinearity were reduced by inserting gaps between the angles and in which collinearity information was increased by adding thick 'necks' to the displays. The results are consistent with predictions and implicate not only the nature of the angle display, but also the way in which observers perform the matching task in the production of assimilation effects.
当一个实心（填充）三角形绕其顶点进行镜面反射，使得一条角边与其反射边形成一条直边时，这条直边看起来像一个朝三角形其他边的方向弯曲的V形，这种效果在方向上与轮廓角出现的著名倾斜错觉相反。有人提出，在双角（布尔东型）显示中出现的这些负立体角错觉（同化效应）是由于未能区分测试（判断）边和立体角的平分线。在双角轮廓显示中，接近零的效应归因于共线性线索的可用性。在两个实验中对这些假设进行了测试，在实验中通过在角之间插入间隙来减少共线性线索，并通过给显示添加粗“颈部”来增加共线性信息。结果与预测一致，不仅涉及角显示的性质，还涉及观察者在产生同化效应时执行匹配任务的方式。
