Motion distorts perceived position without awareness of motion.
Motion distorts perceived position without awareness of motion.
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在没有意识到运动的情况下，运动会扭曲感知的位置。
DOI：
10.1016/j.cub.2005.04.043
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Whitney,David
中科院分区：
文献类型：
--
作者：
Whitney,David
A number of striking illusions show that visual motion influences perceived position [1]; in all of these, the perceived shift is accompanied or preceded by a visible and salient motion signal. Observers can easily scrutinize the motion: they can attentively track, or at least perceive via inference, the moving features [2–4]. With position shifts that accompany the motion aftereffect (MAE)[5–10], for example, observers can attentively track the moving adaptation stimulus [11, 12]. Even if the shifted test pattern does not display any perceived motion [6, 10], the moving adaptation stimulus is clearly visible, and it could be the visibility of the adaptation stimulus that causes the perceived shift in the test stimulus position. If awareness of motion, mediated by high-level or top-down mechanisms, explains all motion-induced position shifts, then there should be no shift in perceived position without the perception of directional motion. Here, we show that perceived position can be shifted even without awareness of motion. To test whether the awareness of motion is necessary to shift perceived position, we used a crowding technique developed by He and colleagues [13]. Figure 1 shows the basic stimulus: an array of drifting Gabor patterns (moving sine wave gratings with static gaussian envelopes). The number and spacing was such that subjects were not aware of, or able to report, the direction of motion in any of the central Gabors (see Supplemental data available with this article online). Each Gabor contained either leftward or rightward motion, determined randomly on each trial. Two vertically aligned pairs ofGabors, however, had motion that was always in opposite directions (dashed and solid circled regions in Figure 1A), providing a consistent adaptation direction across trials. After each trial, the array of Gabors was removed, and a single pair of static test Gabors was presented (Figure 1B), located in either of the regions that were previously adapted to motion (either the solid or dashed circled region in Figure 1A).
