A flash-drag effect in random motion reveals involvement of preattentive motion processing
A flash-drag effect in random motion reveals involvement of preattentive motion processing
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DOI：
10.1167/11.13.12
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发表时间：
2011-01-01
影响因子：
1.8
通讯作者：
Murakami, Ikuya
中科院分区：
文献类型：
--
作者：
Fukiage, Taiki;Whitney, David;Murakami, Ikuya
闪光拖曳（FDE）效应是指一个静止的闪光物体在一个位置的位置似乎在附近的运动方向移动的现象。在过去的十年里，人们一直在争论自下而上和自上而下的过程是如何造成这种错觉的。在这项研究中，我们证明了随机相移光栅可以产生频域均衡。在我们使用的随机运动序列中，FDE诱导器（正弦光栅）每125 ms跳到一个随机相位，并保持静止，直到下一次跳变。由于这种随机序列无法被仔细跟踪，观察者不可能在闪光时辨别跳跃方向。通过基于闪光的起始时间相对于随机运动序列中的每个跳跃时间对数据进行排序，我们发现在跳跃之前大约50至150 ms发生了具有广泛时间调谐的大FDE，并且这种效应与过去或未来的任何其他跳跃都不相关。这些结果表明，只有两帧不可预测的明显运动可以preattentively导致FDE与广泛的时间调谐。
The flash-drag (FDE) effect refers to the phenomenon in which the position of a stationary flashed object in one location appears shifted in the direction of nearby motion. Over the past decade, it has been debated how bottom-up and top-down processes contribute to this illusion. In this study, we demonstrate that randomly phase-shifting gratings can produce the FDE. In the random motion sequence we used, the FDE inducer (a sinusoidal grating) jumped to a random phase every 125 ms and stood still until the next jump. Because this random sequence could not be tracked attentively, it was impossible for the observer to discern the jump direction at the time of the flash. By sorting the data based on the flash's onset time relative to each jump time in the random motion sequence, we found that a large FDE with a broad temporal tuning occurred around 50 to 150 ms before the jump and that this effect was not correlated with any other jumps in the past or future. These results suggest that as few as two frames of unpredictable apparent motion can preattentively cause the FDE with a broad temporal tuning.