Gaze anticipation during human locomotion
Gaze anticipation during human locomotion
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DOI：
10.1007/s00221-012-3241-2
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发表时间：
2012-11-01
影响因子：
2
通讯作者：
Berthoz, Alain
中科院分区：
文献类型：
--
作者：
Bernardin, Delphine;Kadone, Hideki;Berthoz, Alain
在运动过程中，一个自上而下的组织已经被证明，头部作为一个稳定的平台，目光预测轨迹的水平方向。然而，从凝视到轨迹和身体部分的预期序列的定量评估尚未被记录。本文对运动过程中注视方向与身体节段之间的时空预期关系进行了详细的研究。参与者必须在没有任何视觉提示的情况下，沿着几条心理模拟的复杂轨迹行走。轨迹形状被呈现在一张纸上给参与者。我们的研究包括分析水平凝视预期行为方向与即将发生的轨迹变化之间的关系。我们的研究结果证实：1)在复杂轨迹和自由运动中，注视和身体部分方向的层次有序组织。凝视方向预示着头部方向，而头部方向预示着身体其他部分的重新定位。2)轨迹曲率和任务约束对注视与身体节段时空关系的影响：曲率增加导致时间和空间预期增加。3)在拐点处的凝视运动序列不同，在拐点处，凝视计划了更晚的轨迹段。
During locomotion, a top-down organization has been previously demonstrated with the head as a stabilized platform and gaze anticipating the horizontal direction of the trajectory. However, the quantitative assessment of the anticipatory sequence from gaze to trajectory and body segments has not been documented. The present paper provides a detailed investigation into the spatial and temporal anticipatory relationships among the direction of gaze and body segments during locomotion. Participants had to walk along several mentally simulated complex trajectories, without any visual cues indicating the trajectory to follow. The trajectory shapes were presented to the participants on a sheet of paper. Our study includes an analysis of the relationships between horizontal gaze anticipatory behavior direction and the upcoming changes in the trajectory. Our findings confirm the following: 1) The hierarchical ordered organization of gaze and body segment orientations during complex trajectories and free locomotion. Gaze direction anticipates the head orientation, and head orientation anticipates reorientation of the other body segments. 2) The influence of the curvature of the trajectory and constraints of the tasks on the temporal and spatial relationships between gaze and the body segments: Increased curvature resulted in increased time and spatial anticipation. 3) A different sequence of gaze movements at inflection points where gaze plans a much later segment of the trajectory.