Quantitative examination of an unconventional form of the filled-space illusion

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