Bulatov Aleksandr, Marma Vilius, Bulatova Natalija
Laboratory of Visual Neurophysiology, Lithuanian University of Health Sciences, Mickevičiaus 9, LT-44307, Kaunas, Lithuania.
Institute of Biological Systems and Genetics Research, Lithuanian University of Health Sciences, Mickevičiaus 9, LT-44307, Kaunas, Lithuania.
Atten Percept Psychophys. 2020 Jul;82(5):2714-2727. doi: 10.3758/s13414-020-02002-5.
In the illusion of interrupted spatial extent (also known as the filled-space or Oppel-Kundt illusion), the stimulus spatial interval filled with some visual elements (distractors) appears larger than the unfilled interval of the same size. Despite a long history of research, there is still no consensus on the origin of this visual phenomenon. It was recently shown (Bulatov, Bulatova, Surkys, & Mickienė, Acta Neurobiologiae Experimentalis, 77, 157-167, 2017) that the illusion emergence can be associated mainly with the integration of distractor-evoked effects in regions surrounding the endpoints (terminators) of the stimulus intervals. In the present study, we investigated the two-dimensional weighting profiles of these regions of distractors' influence on the magnitude of length misjudgments. We performed psychophysical experiments with three-dot stimuli that contain distracting line segments, the position of which varied either along or perpendicular to the main stimulus axis, thus scanning the profile in two orthogonal directions. It was demonstrated that for distractors shifted along the stimulus axis, the magnitude of the illusion increases to a certain maximum value with the increase of distractors displacement and smoothly decreases to zero thereafter. For distractors shifted orthogonally to the stimulus axis, the illusion magnitude monotonically decreases with the increase of distractors displacement. In the case of the distractor rotation, the greatest illusion magnitude refers to orientations of the distracting line segment along the stimulus axis and decreases to the minimum value for the orthogonal orientation. Based on the analysis of established functional dependencies, we proposed a simple quantitative interpretation of the obtained experimental data.
在中断空间范围错觉（也称为填充空间或奥佩尔 - 昆特错觉）中，填充有一些视觉元素（干扰物）的刺激空间间隔看起来比相同大小的未填充间隔更大。尽管对此视觉现象的起源进行了长期研究，但仍未达成共识。最近有研究表明（布拉托夫、布拉托娃、苏尔基斯和米基耶内，《实验神经生物学学报》，77卷，第157 - 167页，2017年），错觉的出现可能主要与干扰物诱发效应在刺激间隔端点（终止点）周围区域的整合有关。在本研究中，我们研究了这些干扰物影响区域对长度误判大小的二维加权分布。我们用包含干扰线段的三点刺激进行了心理物理学实验，干扰线段的位置沿主刺激轴或垂直于主刺激轴变化，从而在两个正交方向上扫描分布。结果表明，对于沿刺激轴移动的干扰物，错觉大小随着干扰物位移的增加而增加到某个最大值，此后平滑地减小到零。对于垂直于刺激轴移动的干扰物，错觉大小随着干扰物位移的增加而单调减小。在干扰物旋转的情况下，最大错觉大小出现在干扰线段沿刺激轴的方向，而在正交方向上减小到最小值。基于对已建立的函数依赖关系的分析，我们对获得的实验数据提出了一种简单的定量解释。
