The flash grab effect.
The flash grab effect.
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DOI：
10.1016/j.visres.2013.07.007
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发表时间：
2013-10-18
期刊：
影响因子：
1.8
通讯作者：
Anstis, Stuart
中科院分区：
文献类型：
--
作者：
Cavanagh, Patrick;Anstis, Stuart
当一个物体来回移动时，它的轨迹看起来比实际要短得多。物体似乎在其实际反转点之前停止并反转，就好像在大约100 ms的窗口内存在一些位置平均值。令人惊讶的是，如果在轨迹的物理终点处闪烁一个条，就在物体的顶部，就像它反转方向一样，闪光也被移动-被物体抓住-并且在轨迹的感知端点而不是物理端点处被看到。这可以将闪光的感知位置移动多达其物理尺寸的2或3倍，并高达几度的视角。我们首先表明，闪光的位置偏移是由轨迹缩短产生的，因为相同的偏移是有或没有闪光。只有当闪光出现在轨迹物理终点周围的一个小的时空吸引区内时，闪光本身才会被抓住。任何落入该区域的闪光都被拉向感知的终点。该效果与速度成线性比例，直到最大值，并且一旦其高于5%，则与移动刺激的对比度无关。最后，我们证明，这种立场的转变需要注意。这些结果揭示了一个新的“闪光抓取”的家庭中的运动引起的位置偏移的效果。虽然它最类似于闪光拖曳效应，但它在以下方面与此不同：1）它具有不同的时间轮廓，2）它需要注意，3）它大约大10倍。
When an object moves back and forth, its trajectory appears significantly shorter than it actually is. The object appears to stop and reverse well before its actual reversal point, as if there is some averaging of location within a window of about 100 ms. Surprisingly, if a bar is flashed at the physical end point of the trajectory, right on top of the object, just as it reverses direction, the flash is also shifted – grabbed by the object – and is seen at the perceived endpoint of the trajectory rather than the physical endpoint. This can shift the perceived location of the flash by as much as 2 or 3 times its physical size and by up to several degrees of visual angle. We first show that the position shift of the flash is generated by the trajectory shortening, as the same shift is seen with or without the flash. The flash itself is only grabbed if it is presented within a small spatiotemporal attraction zone around the physical end point of the trajectory. Any flash falling in that zone is pulled toward the perceived endpoint. The effect scales linearly with speed, up to a maximum, and is independent of the contrast of the moving stimulus once it is above 5%. Finally, we demonstrate that this position shift requires attention. These results reveal a new “flash grab” effect in the family of motion-induced position shifts. Although it most resembles the flash drag effect, it differs from this in the following ways: 1) it has a different temporal profile, 2) it requires attention, 3) it is about 10 times larger.
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