Detection of collision events on curved trajectories: optical information from invariant rate-of-bearing change.
Detection of collision events on curved trajectories: optical information from invariant rate-of-bearing change.
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DOI：
10.3758/pp/70.7.1314
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发表时间：
2008-10
期刊：
影响因子：
--
通讯作者：
Andersen GJ
中科院分区：
文献类型：
--
作者：
Ni R;Andersen GJ
以前的研究表明，直线轨迹碰撞事件(即运动物体与观察者之间的碰撞)是由正在扩展并保持恒定方位的物体指定的(物体在视场中的位置保持恒定)。在本研究中，我们研究了当轨迹为常曲率时用于检测碰撞事件的光学信息。在这些条件下，碰撞事件由对象的膨胀和恒定的方位变化率来指定。进行了三个实验，在保持碰撞对象的接触时间、速度和初始图像位置不变的情况下，改变轨迹曲率和显示持续时间。结果表明，碰撞检测性能随着轨迹曲率的增加而降低，随着显示时间的减少而降低，尤其是对于高度弯曲的轨迹。在实验3中，我们发现，在非碰撞刺激中呈现恒定的方位变化会导致错误警报率的增加。这些结果表明，观测者可以检测到弯曲轨迹上的碰撞事件，并且观测者利用了方位变化信息。
Previous research has shown that a linear-trajectory collision event (i.e., collision between a moving object and an observer) is specified by objects that are expanding and maintain a constant bearing (the object location remains constant in the visual field). In the present study we examined the optical information for detecting a collision event when the trajectory was of constant curvature. Under these conditions, a collision event is specified by expansion of an object and a constant rate-of-bearing change. Three experiments were conducted in which trajectory curvature and display duration were varied while maintaining time-to-contact, speed, and initial image position of the collision objects. Results indicate that collision detection performance decreased with an increase in trajectory curvature and decreased with a decrease in display duration, especially for highly curved trajectories. In Experiment 3 we found that the presentation of constant rate-of-bearing change in non-collision stimuli resulted in an increase in the false alarm rate. These results demonstrate that observers can detect collision events on curved trajectories, and that observers utilize bearing change information.