Spatial Coding of the Predicted Impact Location of a Looming Object
Spatial Coding of the Predicted Impact Location of a Looming Object
复制标题
隐现物体预测撞击位置的空间编码
DOI：
10.1016/j.cub.2004.06.047
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发表时间：
2004
期刊：
影响因子：
9.2
通讯作者：
J. Duhamel
中科院分区：
文献类型：
--
作者：
M. Neppi;David Auclair;A. Sirigu;J. Duhamel
避免或拦截迫近的物体意味着对接触前的时间和撞击位置的精确估计[1-4]。在自然情况下，外推相对于一些自我中心标志的运动轨迹需要考虑与身体姿势的时刻变化相关的视网膜输入的变化[5-7]。在这里，人类观察者预测的影响位置在他们的脸上的一个接近的刺激安装在一个机器人手臂，而我们系统地操纵眼睛，头部和躯干方向之间的关系。当目标来自与头部和眼睛轴线对齐的位置时，对观察者脸上的投影弹着点的估计最准确。偏心的目标相对于任何一个轴导致了系统的感知偏差同侧的轨迹的起源。我们得出结论：（1）预测一个隐约可见的目标的撞击点需要结合视网膜信息和眼睛位置信息，（2）对于这些线索的一些但不是所有可能的组合，这种计算是准确完成的，（3）隐约可见的轨迹的表示不是在一个单一的、规范的参考系中形成的，（4）观察到的知觉偏差可能反映了在近个人空间内对拦截/防御行为的自动适应。
Avoiding or intercepting looming objects implies a precise estimate of both time until contact and impact location [1–4]. In natural situations, extrapolating a movement trajectory relative to some egocentric landmark requires taking into account variations in retinal input associated with moment-to-moment changes in body posture [5-7]. Here, human observers predicted the impact location on their face of an approaching stimulus mounted on a robotic arm, while we systematically manipulated the relation between eye, head, and trunk orientation. The projected impact point on the observer's face was estimated most accurately when the target originated from a location aligned with both the head and eye axes. Eccentric targets with respect to either axis resulted in a systematic perceptual bias ipsilateral to the trajectory's origin. We conclude that (1) predicting the impact point of a looming target requires combining retinal information with eye position information, (2) that this computation is accomplished accurately for some, but not all, possible combinations of these cues, (3) that the representation of looming trajectories is not formed in a single, canonical reference frame, and (4) that the observed perceptual biases could reflect an automatic adaptation for interceptive/defensive actions within near peripersonal space.