Le Seac'h Anne B, McIntyre Joseph
Laboratoire de Neurobiologie des Réseaux Sensorimoteurs, CNRS, Université Paris Descartes, France.
Neurosci Lett. 2007 Aug 23;423(3):211-5. doi: 10.1016/j.neulet.2007.07.034. Epub 2007 Aug 6.
In this study we investigated the reference frames used to plan arm movements. Specifically, we asked whether the body axis, visual cues and graviception can each play a role in defining "up" and "down" in the planning and execution of movements along the vertical axis. Horizontal and vertical pointing movements were tested in two postures (upright and reclined) and two visual conditions (with and without vision) to identify possible effects of each of these cues on kinematics of movement. Movements were recorded using an optical 3D tracking system and analysis was conducted on velocity profiles of the hand. Despite a major effect of gravity, our analysis shows an effect of the movement direction with respect to the body axis when subjects were reclined with eyes closed. These results suggest that our CNS takes into account multimodal information about vertical in order to compute an optimal motor command that anticipates the effects of gravity.
在本研究中，我们调查了用于规划手臂运动的参考框架。具体而言，我们询问身体轴线、视觉线索和重力感知是否各自能在沿垂直轴的运动规划和执行中发挥作用来定义“上”和“下”。在两种姿势（直立和斜躺）和两种视觉条件（有视觉和无视觉）下测试水平和垂直指向运动，以确定这些线索中的每一个对运动运动学的可能影响。使用光学3D跟踪系统记录运动，并对手部速度曲线进行分析。尽管重力有重大影响，但我们的分析表明，当受试者闭眼斜躺时，运动方向相对于身体轴线有影响。这些结果表明，我们的中枢神经系统会考虑关于垂直方向的多模态信息，以便计算出一个能预测重力影响的最佳运动指令。
