Actions and consequences in bimanual interaction are represented in different coordinate systems.
Actions and consequences in bimanual interaction are represented in different coordinate systems.
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DOI：
10.1523/jneurosci.0943-06.2006
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发表时间：
2006-06-28
期刊：
影响因子：
--
通讯作者：
Wolpert DM
中科院分区：
文献类型：
--
作者：
Bays PM;Wolpert DM
移动身体的一部分会产生相互作用力，而这些作用力往往会使身体的其他部分不稳定。然而，稳定性是通过预测和积极对抗这些相互作用力的机制来维持的。当我们的身体或环境发生变化时，这些预期机制会进行调整，以便继续做出准确的预测。在这项研究中，我们研究收购的一种新的预测协调之间的武器，在这种情况下，其中一个力是一方面产生的结果，另一方面的行动。具体地说，施加于左手的力取决于右手的速度。通过练习，受试者学会了在右臂运动期间通过预测和积极对抗外部施加的力来稳定受干扰的左臂。适应之后，我们研究了学习如何推广到右臂或左臂的新关节配置，以研究从运动到力的内部转换所代表的坐标系。这揭示了右臂动作的表示和其结果的表示之间的分离，即左臂上的力。运动表示在与手的速度相关的外部坐标中，而运动产生的力表示在基于关节的内部坐标系中。
Moving one part of the body can generate interaction forces that tend to destabilise other parts of the body. However, stability is maintained by mechanisms that predict and actively oppose these interaction forces. When our body or environment changes these anticipatory mechanisms adapt so as to continue to produce accurate predictions. In this study we examine the acquisition of a novel predictive coordination between the arms, in a situation in which a force is produced on one hand as a consequence of the action of the other hand. Specifically, a force was applied to the left hand that depended on the velocity of the right hand. With practice, subjects learned to stabilise the perturbed left arm during right arm movements by predicting and actively opposing the externally applied forces. Following adaptation, we examined how learning generalised to a new joint configuration of the right or left arm, in order to investigate the coordinate systems in which the internal transformation from movement to force is represented. This revealed a dissociation between the representation of the action of the right arm and the representation of its consequence, that is the force on the left arm. The movement is represented in extrinsic coordinates related to the velocity of the hand, whereas the force resulting from the movement is represented in a joint-based intrinsic coordinate system.