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Quantitative examination of an unconventional form of the filled-space illusion
Attention, Perception, & Psychophysics ( IF 1.7 ) Pub Date : 2021-03-31 , DOI: 10.3758/s13414-021-02304-2
Aleksandr Bulatov , Natalija Bulatova , Edgaras Diržius

The spatial interval containing some visual elements (fillers) seems to be longer than an empty interval of the same length, and the effect persists for most observers. This illusion of interrupted spatial extent (or the filled-space illusion) can be observed even in extremely simplified line drawings, but its origin is still not completely understood. Recently, we proposed a quantitative explanation for the results of experiments with stimuli containing either continuous or discrete filling: the illusion may be associated with the integration of distractor-induced effects near the endpoints (terminators) of the stimulus intervals. Subsequent analysis of the principles underlying the explanation allowed us to hypothesize the appearance of illusory effects caused by previously unknown stimulus modifications. To test the suggestions, in the present study we performed experiments with three-dot stimuli that contain a distracting circle (either outline or uniformly filled) surrounding one of the lateral terminators. It has been demonstrated that the illusion magnitude varies predictably with the size of the circle, and there is no significant difference between the data obtained for stimuli with the outline and filled distractors. To more thoroughly examine the illusion, the central angle of circular distracting arcs (real or imaginary) was used as an independent variable in supplementary experiments. A rather successful theoretical interpretation of the experimental results supports the suggestion that perceptual positional biases induced by additional context-evoked neural excitation can be considered as one of the main causes of the filled-space illusion.



中文翻译:

定量检查非常规形式的填充幻觉

包含某些视觉元素(填充物)的空间间隔似乎长于相同长度的空间隔,并且这种影响对于大多数观察者而言仍然存在。即使在极为简化的线条图中,也可以观察到这种中断的空间范围的幻觉(或填充的空间幻象),但其起源仍未完全理解。最近,我们对包含连续或离散填充的刺激的实验结果提出了定量的解释:错觉可能与刺激间隔的端点(终止子)附近的干扰物诱导效应的整合有关。随后,对解释依据的原理进行了分析,使我们能够假设由先前未知的刺激修改引起的幻觉效应的出现。为了测试建议,在本研究中,我们对三点刺激进行了实验,这些刺激包含一个分散的圆圈(轮廓或均匀填充),这些圆圈围绕着一个横向终止子。已经证明,幻觉的大小可预测地随圆的大小而变化,并且获得的轮廓和实心干扰物刺激数据之间没有显着差异。为了更彻底地检查错觉,在辅助实验中,使用了圆形分散弧(实心或虚构)的中心角作为自变量。对实验结果的相当成功的理论解释支持了这样的建议,即由额外的上下文诱发的神经激励引起的感知位置偏差可以被认为是填充空间错觉的主要原因之一。

更新日期:2021-04-01
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