Functional reorganization of upper-body movement after spinal cord injury
Functional reorganization of upper-body movement after spinal cord injury
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DOI：
10.1007/s00221-010-2427-8
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发表时间：
2010-12-01
影响因子：
2
通讯作者：
Mussa-Ivaldi, Ferdinando A.
中科院分区：
文献类型：
--
作者：
Casadio, Maura;Pressman, Assaf;Mussa-Ivaldi, Ferdinando A.
脊髓损伤的幸存者需要重新组织他们剩余的身体运动，以便与辅助设备进行互动，并进行以前容易和自然的活动。为了研究运动重组，我们要求高水平脊髓损伤（SCI）的受试者和未受损的受试者通过执行上半身运动来控制屏幕上的光标。虽然这项任务通常是通过操作电脑鼠标来完成的，但在这里，肩部运动被映射到光标位置。控制组和SCI组的受试者都能迅速重组他们的动作，并成功地控制光标。两组中的大多数受试者都成功地减少了不能有效产生光标运动的运动。这与控制系统仅仅关注目标的精确获取而不关注与该目标无关的运动的假设不一致。相比之下，我们的研究结果表明，受试者可以学会重新组织协调，以增加他们的上半身运动的子空间与受控光标移动的平面之间的对应关系。这实际上等同于构建由实验建立的从身体运动到光标运动的映射的逆内部模型。这些结果是相关的辅助设备，优化使用剩余的自愿控制和提高残疾用户的学习过程中，寻找一个易于学习的地图之间的身体运动空间和控制空间的设备接口的发展。
Survivors of spinal cord injury need to reorganize their residual body movements for interacting with assistive devices and performing activities that used to be easy and natural. To investigate movement reorganization, we asked subjects with high-level spinal cord injury (SCI) and unimpaired subjects to control a cursor on a screen by performing upper-body motions. While this task would be normally accomplished by operating a computer mouse, here shoulder motions were mapped into the cursor position. Both the control and the SCI subjects were rapidly able to reorganize their movements and to successfully control the cursor. The majority of the subjects in both groups were successful in reducing the movements that were not effective at producing cursor motions. This is inconsistent with the hypothesis that the control system is merely concerned with the accurate acquisition of the targets and is unconcerned with motions that are not relevant to this goal. In contrast, our findings suggest that subjects can learn to reorganize coordination so as to increase the correspondence between the subspace of their upper-body motions with the plane in which the controlled cursor moves. This is effectively equivalent to constructing an inverse internal model of the map from body motions to cursor motions, established by the experiment. These results are relevant to the development of interfaces for assistive devices that optimize the use of residual voluntary control and enhance the learning process in disabled users, searching for an easily learnable map between their body motor space and control space of the device.