Redies C, Spillman L
Perception. 1982;10(6):667-81. doi: 10.1068/p100667.
Van Tuijl's neon color effect arises in the Ehrenstein figure if a colored cross is added such as to connect the black arms across the central gap. The effect consists of a circular veil of color in the illusory area and has the same hue as the inducing cross. The neon-like coloration is uniform, or when elicited by two color bipartite; it is strongest on backgrounds resembling the color of the cross. The effect cannot be attributed to chromatic aberration or eye movements. In foveal vision (and for red crosses) neon spreading is limited to gap sizes between 4 and 35 min of arc. Extrafoveally, gap sizes may be larger by a factor of two. Neon perception is enhanced by flicker and weakened if stimuli are oriented obliquely. It does not occur with dichoptic presentation. A maximum illusion requires that the Ehrenstein figure and cross are laterally and angularly aligned for good perceptual continuation. A neuronal origin by spreading and summation, together with cognitive processes, is proposed.
如果在埃伦斯坦图形中添加一个彩色十字，使其穿过中心间隙连接黑色臂，就会出现范·图伊尔的霓虹色效应。该效应表现为在虚幻区域有一个圆形的彩色面纱，其色调与诱发十字相同。这种类似霓虹的色彩是均匀的，或者当由两种颜色二分法诱发时；在与十字颜色相似的背景上最强。该效应不能归因于色差或眼球运动。在中央凹视觉中（对于红色十字），霓虹扩散限于4到35分视角的间隙大小。在中央凹外，间隙大小可能会大两倍。闪烁会增强霓虹感知，而如果刺激倾斜呈现则会减弱。双眼分别呈现时不会出现这种情况。最大的错觉要求埃伦斯坦图形和十字在横向和角度上对齐，以便有良好的感知连续性。有人提出这是通过扩散和总和以及认知过程产生的神经元起源。
