Motion perception by a moving observer in a three-dimensional environment
Motion perception by a moving observer in a three-dimensional environment
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DOI：
10.1167/13.2.15
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发表时间：
2013-01-01
影响因子：
1.8
通讯作者：
Wexler, Mark
中科院分区：
文献类型：
--
作者：
Dupin, Lucile;Wexler, Mark
在世界中移动时感知三维物体的运动是困难的：不仅必须分割光流并将视差分解为形状和运动，而且还需要考虑观察者的运动，以便感知绝对运动，而不是相对运动。为了简化最后一步，最近有人提出，如果视觉背景是静止的，那么相对于背景计算的前景对象运动直接产生绝对运动。一系列的研究与不动的观察者和光流模拟观察者的运动提供了证据，观察者实际上利用这种所谓的“流解析”的策略（拉什顿和沃伦，2005年）。我们测试这一假设通过使用移动的观察员（以及im移动的）谁判断的前景物体在一个静止或移动的背景存在的深度运动。我们发现，背景运动确实会影响运动知觉，但并不像流解析假设所预测的那样多。因此，我们发现的证据表明，为了感知绝对运动，观察者部分使用流解析，但也补偿自我中心的运动的全球自我运动估计。
Perceiving three-dimensional object motion while moving through the world is hard: not only must optic flow be segmented and parallax resolved into shape and motion, but also observer motion needs to be taken into account in order to perceive absolute, rather than observer-relative motion. In order to simplify the last step, it has recently been suggested that if the visual background is stationary, then foreground object motion, computed relative to the background, directly yields absolute motion. A series of studies with immobile observers and optic flow simulating observer movement have provided evidence that observers actually utilize this so-called "flow parsing" strategy (Rushton & Warren, 2005). We test this hypothesis by using mobile observers (as well as immobile ones) who judge the motion in depth of a foreground object in the presence of a stationary or moving background. We find that background movement does influence motion perception but not as much as predicted by the flow-parsing hypothesis. Thus, we find evidence that, in order to perceive absolute motion, observers partly use flow-parsing but also compensate egocentric motion by a global self-motion estimate.