Postdictive Modulation of Visual Orientation
Postdictive Modulation of Visual Orientation
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DOI：
10.1371/journal.pone.0032608
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发表时间：
2012-02-29
期刊：
影响因子：
3.7
通讯作者：
Kawabe, Takahiro
中科院分区：
文献类型：
--
作者：
Kawabe, Takahiro
本研究探讨了视觉定向是如何被随后的定向输入调制的。观察员提出了一个接近垂直的伽柏补丁作为目标，其次是左或右倾斜的第二伽柏补丁作为干扰在空间附近的目标。观察者的任务是判断目标是否向右或向左倾斜（实验1）或目标是否垂直（补充实验）。判断偏向于干扰物的方向（视觉方向的后向调制）。判断偏差达到峰值时，目标和分心是暂时分开的100毫秒，表明这种现象的一个特定的时间机制。然而，当分心物的可见性通过后向掩蔽降低时，判断偏差消失。另一方面，低可见度干扰物仍然可以引起同时的方向对比，表明干扰物的方向仍然在视觉系统中处理（实验2）。我们的研究结果表明，视觉方向的后向调制源于时空整合的基础上，一个缓慢的特征匹配过程。
The present study investigated how visual orientation is modulated by subsequent orientation inputs. Observers were presented a near-vertical Gabor patch as a target, followed by a left- or right-tilted second Gabor patch as a distracter in the spatial vicinity of the target. The task of the observers was to judge whether the target was right-or left-tilted (Experiment 1) or whether the target was vertical or not (Supplementary experiment). The judgment was biased toward the orientation of the distracter (the postdictive modulation of visual orientation). The judgment bias peaked when the target and distracter were temporally separated by 100 ms, indicating a specific temporal mechanism for this phenomenon. However, when the visibility of the distracter was reduced via backward masking, the judgment bias disappeared. On the other hand, the low-visibility distracter could still cause a simultaneous orientation contrast, indicating that the distracter orientation is still processed in the visual system (Experiment 2). Our results suggest that the postdictive modulation of visual orientation stems from spatiotemporal integration of visual orientation on the basis of a slow feature matching process.