Post Robert B, Welch Robert B
Department of Psychology, University of California, Davis, California 95616, USA.
Percept Psychophys. 2004 Aug;66(6):1045-55. doi: 10.3758/bf03194994.
In the present research, we examined the influence of induced motion (IM) on open-loop pointing responses and the possibility that IM alters the registration of either eye or trunk position. In two experiments, subjects tracked a dot that oscillated vertically while a rectangular stimulus oscillated horizontally. The pairing of frame and dot motion caused the dot to appear to move on a slant, due to IM. In the first experiment, the subjects made judgments of the apparent slant of the dot's motion and, on separate trials, pointed open loop at the apparent location of the dot at the endpoints of its motion. Both responses were influenced by IM, although the effect on dot localization was less than the amount predicted by the IM, as indicated by the slant responses. Results were similar immediately following IM and after a 5-sec delay. In the second experiment, the subjects pointed open loop either at the apparent location of the endpoints of the tracked dot's motion or at the apparent location of one of three other briefly flashed stationary dots. The pointing responses directed toward the fixated IM target were influenced by IM to a greater extent than the responses directed toward the stationary dots. The results of the two experiments are inconsistent with the hypothesis that the effect of IM on open-loop pointing at the IM target results completely from altered perception of either eye or trunk position, since misregistration of either would be expected to influence, in a similar fashion, pointing at both the tracked dot and the briefly flashed, stationary targets.
在本研究中，我们考察了诱导运动（IM）对开环指向反应的影响，以及IM改变眼睛或躯干位置记录的可能性。在两个实验中，受试者追踪一个垂直振荡的点，同时一个矩形刺激物水平振荡。由于诱导运动，框架和点的运动配对导致点看起来沿斜线移动。在第一个实验中，受试者对该点运动的视在斜线进行判断，并在不同的试验中，在该点运动终点的视在位置进行开环指向。两种反应均受诱导运动影响，尽管如斜线反应所示，对该点定位的影响小于诱导运动预测的量。诱导运动后立即及延迟5秒后的结果相似。在第二个实验中，受试者要么在被追踪点运动终点的视在位置进行开环指向，要么在其他三个短暂闪烁的静止点之一的视在位置进行开环指向。指向固定诱导运动目标的反应比指向静止点的反应受诱导运动的影响更大。这两个实验的结果与以下假设不一致，即诱导运动对指向诱导运动目标的开环指向的影响完全源于眼睛或躯干位置感知的改变，因为预计其中任何一个的配准错误都会以类似方式影响对被追踪点和短暂闪烁的静止目标的指向。
