Polat Uri, Sagi Dov
Goldschleger Eye Research Institute, Tel-Aviv University, Sheba Medical Center, 52621 Tel-Hashomer, Israel.
Vision Res. 2007 Aug;47(18):2473-81. doi: 10.1016/j.visres.2007.06.007. Epub 2007 Jul 25.
We explored the relationship between filling-in processes and the known increase in detection sensitivity observed for targets presented between collinear flankers. Filling-in was probed using a Yes/No detection task by measuring the false-positive reports (false-alarm, FA) and hit rate (Hit) for a low-contrast Gabor target with different target-flankers distances. Observers increased the number of reports on the presence of a target (FA and Hit) when the flankers' distance was within the known range of facilitatory lateral interactions. This bias in reporting was reduced with blocked stimulation, when the target-flanker distance was kept fixed across trials. When different distances were mixed by trials the bias followed the pattern of lateral interactions across distance. The effect was maximal when flankers and targets were aligned. These false perceptions are most likely the result of a filling-in process by lateral excitation that produces illusory contours.
我们探究了填补过程与在共线侧翼刺激之间呈现的目标检测灵敏度已知增加之间的关系。通过使用是/否检测任务，通过测量具有不同目标-侧翼距离的低对比度Gabor目标的误报报告（误报，FA）和命中率（命中，Hit）来探测填补过程。当侧翼距离在已知的促进性侧向相互作用范围内时，观察者增加了关于目标存在的报告数量（FA和命中）。当目标-侧翼距离在各试验中保持固定时，这种报告偏差会因阻断刺激而降低。当不同距离在各试验中混合时，偏差遵循跨距离的侧向相互作用模式。当侧翼和目标对齐时，这种效应最大。这些错误感知很可能是由产生虚幻轮廓的侧向兴奋引起的填补过程的结果。
