Direction-dependent differences in temporal kinematics for vertical prehension movements
Direction-dependent differences in temporal kinematics for vertical prehension movements
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DOI：
10.1007/s00221-013-3783-y
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发表时间：
2014-02-01
影响因子：
2
通讯作者：
Kushiro, Keisuke
中科院分区：
文献类型：
--
作者：
Yamamoto, Shinji;Kushiro, Keisuke
在我们的日常生活中，我们可以适当地在地球上进行运动，这表明中枢神经系统考虑到了运动过程中作用在我们身体上的引力。最近，已经观察到引力在抓取运动的运动学空间特性中产生方向依赖的差异。然而，关于引力如何影响这些运动的运动学的时间特性，人们知之甚少。在这项研究中，我们试图通过比较向上（反重力）和向下（有重力）运动来阐明重力对运动运动学的时间特性的影响。结果，我们发现在运动的到达和抓取组件的时间运动学的方向依赖的差异。对于到达分量，向上运动的加速时间比向下运动的加速时间短。在抓握部分，参与者对向上的动作比向下的动作更早、更快地张开双手。时间运动学中这些方向相关的差异表明，中枢神经系统在运动计划和垂直抓握运动的控制中考虑并利用了重力效应。
In our daily lives, we can appropriately perform movements on the earth, suggesting that the central nervous system takes into account gravitational forces that act on our bodies during the movements. Recently, gravitational forces have been observed to generate the direction-dependent differences in the spatial properties of the kinematics of prehension movements. However, little is known about how gravitational forces affect the temporal properties of the kinematics of these movements. In this study, we tried to elucidate the gravitational effects on the temporal properties of the kinematics of movements by comparing upward (against gravity) and downward (with gravity) movements. As a result, we found the direction-dependent differences in temporal kinematics in both the reaching and grasping components of movements. For the reaching component, a shorter acceleration time was observed for the upward movements compared to the downward movements. For the grasping component, participants opened their hands earlier and faster for the upward movements than for the downward movements. These direction-dependent differences in the temporal kinematics suggested that the central nervous system takes into account and takes advantage of gravitational effects in the motor plans and controls of vertical prehension movements.