Parovel Giulia, Costall Alan
Department of Social, Political and Cognitive Sciences, University of Siena, Italy.
Department of Psychology, University of Portsmouth, UK.
Iperception. 2018 Feb 19;9(1):2041669518758778. doi: 10.1177/2041669518758778. eCollection 2018 Jan-Feb.
The leaning tower illusion is a perceptual illusion in which two identical images of a tower photographed from below appear to diverge when juxtaposed. We manipulated the perceived obliqueness of the (upright) St Mark bell tower in Venice by modifying two parameters both related to the position of the camera with respect to the tower: (a) increasing the peripherality of the tower and (b) reducing the distance between the camera and the tower. The resulting images clearly show that the illusory leaning effect increases as a function of the obliqueness. Another crucial condition for the leaning tower effect must be that the twin images are perceived as parts of a unitary display: The illusion increases when the distance between the photos is progressively increased, but beyond a certain level of separation, the integration of the images should, of course, break down, and the illusion vanish.
比萨斜塔错觉是一种视觉错觉，从下方拍摄的两座相同的塔的图像并列时似乎会发散。我们通过修改与相机相对于塔的位置相关的两个参数，来操控（直立的）威尼斯圣马可钟楼的感知倾斜度：（a）增加塔在画面中的边缘位置，以及（b）缩短相机与塔之间的距离。生成的图像清楚地表明，错觉性的倾斜效果随着倾斜度的增加而增强。比萨斜塔效应的另一个关键条件必须是，孪生图像被视为一个整体显示的部分：当照片之间的距离逐渐增加时，错觉会增强，但超过一定的分离程度，图像的整合当然会瓦解，错觉也会消失。
