Kim Jihyun, Francis Gregory
Department of Psychological Sciences, Purdue University, 703 Third Street, West Lafayette, IN 47906, USA.
J Vis. 2011 Mar 31;11(3):23. doi: 10.1167/11.3.23.
R. van Lier, M. Vergeer, and S. Anstis (2009) reported an afterimage that produced different percepts from an inducing stimulus depending on the shape of a subsequent contour. G. Francis (2010) explained this phenomenon with a model where the contour forms a boundary that traps the afterimage color as it spreads across a surface. We conducted a series of additional model simulations and experiments to test the explanation. We first tested the hypothesis that the contour traps the afterimage color by adding additional contours. Model simulations suggest that additional contours could block color from spreading to the middle of the surface. In two experiments, additional contours blocked color spreading when they were at the inducer edges but not when they were drawn away from the inducer edges. In a second set of experiments, we investigated the model prediction that the drawn contour defines the perceived shape of the afterimage. New model simulations predict that variations in the size of the drawn contour force the perceived afterimage to vary accordingly. However, an experimental study revealed that the perceived afterimage size remains the same as the inducing stimulus. The simulation and experimental results both highlight and challenge important characteristics of the model.
R. 范·利尔、M. 韦尔吉尔和S. 安斯蒂斯（2009年）报告了一种后像，根据后续轮廓的形状，该后像会产生与诱导刺激不同的感知。G. 弗朗西斯（2010年）用一个模型解释了这一现象，在该模型中，轮廓形成了一个边界，当后像颜色在表面扩散时，该边界会捕获后像颜色。我们进行了一系列额外的模型模拟和实验来检验这一解释。我们首先通过添加额外的轮廓来检验轮廓捕获后像颜色的假设。模型模拟表明，额外的轮廓可以阻止颜色扩散到表面中间。在两个实验中，当额外的轮廓位于诱导物边缘时，它们会阻止颜色扩散，但当它们远离诱导物边缘绘制时则不会。在第二组实验中，我们研究了模型预测，即绘制的轮廓定义了后像的感知形状。新的模型模拟预测，绘制轮廓大小的变化会迫使感知到的后像相应地变化。然而，一项实验研究表明，感知到的后像大小与诱导刺激保持相同。模拟和实验结果既突出了该模型的重要特征，也对其提出了挑战。
