Department of Psychology, University of California San Diego, La Jolla, CA, USA.
Department of Psychology, Glendon College, North York ON, Canada.
J Vis. 2024 Aug 1;24(8):13. doi: 10.1167/jov.24.8.13.
Motion can produce large changes in the apparent locations of briefly flashed tests presented on or near the motion. These motion-induced position shifts may have a variety of sources. They may be due to a frame effect where the moving pattern provides a frame of reference for the locations of events within it. The motion of the background may act through high-level mechanisms that track its explicit contours or the motion may act on position through the signals from low-level motion detectors. Here we isolate the contribution of low-level motion by eliminating explicit contours and trackable features. In this case, motion still supports a robust shift in probe locations with the shift being in the direction of the motion that follows the probe. Although robust, the magnitude of the shift in our first experiment is about 20% of the shift seen in a previous study with explicit frames and, in the second, about 45% of that found with explicit frames. Clearly, low-level motion alone can produce position shifts although the magnitude is much reduced compared to that seen when high-level mechanisms can contribute.
运动可以使短暂呈现的测试的明显位置发生很大变化，这些测试呈现或靠近运动。这些运动引起的位置变化可能有多种来源。它们可能是由于框架效应，其中移动的模式为其内部事件的位置提供了参考框架。背景的运动可能通过跟踪其明确轮廓的高层机制起作用，或者运动可能通过来自低水平运动探测器的信号作用于位置。在这里，我们通过消除明确的轮廓和可跟踪的特征来隔离低水平运动的贡献。在这种情况下，运动仍然支持探针位置的强烈变化，这种变化与跟随探针的运动方向一致。虽然很明显，但我们第一个实验中的变化幅度约为之前使用明确框架的研究中观察到的变化幅度的 20%，而在第二个实验中，约为使用明确框架时发现的变化幅度的 45%。显然，低水平运动本身就可以产生位置变化，尽管与高层机制能够产生的变化幅度相比，变化幅度要小得多。
