Salvano-Pardieu V
Psychology Division, University of Wolverhampton, UK.
Perception. 2000;29(6):709-20. doi: 10.1068/p2922.
The strength of brightness illusion in an Ehrenstein figure has been examined as a function of two variables--inducing line length and gap size--by a two-alternative forced-choice procedure. The results show an interaction between the two variables; the length of the inducers and gap size are both involved in the formation of the brightness illusion, with gap size as the stronger factor. A spatial limit (corresponding to a gap size of 2.4 deg) was found, below which the illusion is always present regardless of the length of the inducers. An area ratio, defined as the ratio of the area of the ring formed by the four inducing lines of an Ehrenstein figure to the area of the illusory surface, takes into account the different spatial factors studied in the experiment and the global size of the Ehrenstein figure. The strength of the illusion was found to increase linearly with increasing values of the area ratio.
通过二选一的强迫选择程序，研究了埃伦斯坦图形中明度错觉的强度与两个变量——诱导线长度和间隙大小——之间的函数关系。结果显示这两个变量之间存在交互作用；诱导线的长度和间隙大小都参与了明度错觉的形成，其中间隙大小是更强的因素。发现了一个空间极限（对应于2.4度的间隙大小），低于这个极限，无论诱导线的长度如何，错觉总是存在。面积比定义为埃伦斯坦图形的四条诱导线所形成的环的面积与错觉表面面积的比值，它考虑了实验中研究的不同空间因素以及埃伦斯坦图形的整体大小。发现错觉的强度随着面积比的增加而线性增加。
