Whole-Body Roll Tilt Influences Goal-Directed Upper Limb Movements through the Perceptual Tilt of Egocentric Reference Frame.
Whole-Body Roll Tilt Influences Goal-Directed Upper Limb Movements through the Perceptual Tilt of Egocentric Reference Frame.
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DOI：
10.3389/fpsyg.2018.00084
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发表时间：
2018
影响因子：
3.8
通讯作者：
Kushiro K
中科院分区：
文献类型：
--
作者：
Tani K;Shiraki Y;Yamamoto S;Kodaka Y;Kushiro K
在我们的日常生活中，我们可以毫不费力地准确地接触到我们引力环境中的物体。即使当身体相对于重力倾斜时，也可以做到这一点。这是通过中枢神经系统(CNS)根据身体倾斜的大小对作用于上肢的重力和扭矩进行补偿来实现的。本研究调查了身体方向相对于重力的改变如何影响上肢运动的表现。我们观察了在身体倾斜的情况下，上肢触及记忆中的目标时食指的空间轨迹。结果显示，指尖的末端位置向身体倾斜的方向偏离实际目标位置。随后的实验检查了身体纵轴的感知方向是否相对于滚动面中的真实方向发生了移动。结果表明，在第一次实验中，身体纵轴的感知方向向身体倾斜方向移动，这与终端位置的移动有关。这些结果表明，全身倾斜引起的自我中心坐标和重力坐标之间的分离导致了自我中心动作参照系的系统性移动，进而影响了目标导向的上肢运动的运动表现。
In our day-to-day life, we can accurately reach for an object in our gravitational environment without any effort. This can be achieved even when the body is tilted relative to gravity. This is accomplished by the central nervous system (CNS) compensation for gravitational forces and torque acting on the upper limbs, based on the magnitude of body tilt. The present study investigated how performance of upper limb movements was influenced by the alteration of body orientation relative to gravity. We observed the spatial trajectory of the index finger while the upper limb reached for a memorized target with the body tilted in roll plane. Results showed that the terminal location of the fingertip shifted toward the direction of body tilt away from the actual target location. The subsequent experiment examined if the perceived direction of the body longitudinal axis shifted relative to the true direction in roll plane. The results showed that the perceived direction of the body longitudinal axis shifted toward the direction of the body tilt, which correlated with the shift of the terminal location in the first experiment. These results suggest that the dissociation between the egocentric and gravitational coordinates induced by whole-body tilt leads to systematic shifts of the egocentric reference frame for action, which in turn influences the motor performance of goal-directed upper limb movements.
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