Interlimb transfer of visuomotor rotations: independence of direction and final position information
Interlimb transfer of visuomotor rotations: independence of direction and final position information
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DOI：
10.1007/s00221-002-1140-7
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发表时间：
2002-08-01
影响因子：
2
通讯作者：
Wang, JS
中科院分区：
文献类型：
--
作者：
Sainburg, RL;Wang, JS
我们实验室之前的研究结果支持这样的观点，即在协调多关节到达运动期间指定轨迹方向和形状的节间动力学方面，主导臂比非主导臂更熟练。我们还表明，右臂和左臂对新型视觉运动旋转的适应是等效的，这表明该过程发生在区分主导臂和非主导臂表现的过程的上游。因此，我们推测这种视觉运动适应可能会在另一只手臂的适应过程中转移到后续的表现上。我们现在检查对新颖视觉运动旋转的对侧手臂训练是否会影响左右臂的适应。两个受试者组，RL 和 LR，每组由 7 名惯用右手的受试者组成，在八个方向执行从中心向外的伸展任务期间，适应视觉显示中的 30 度逆时针旋转。每组首先使用右臂（RL）或左臂（LR）进行适应，然后进行相反的手臂适应。为了评估转移，我们将对侧手臂适应后的同侧手臂运动（右或左）与对侧手臂适应前进行的运动进行了比较。我们的研究结果表明，学习在手臂之间的转移是明确的。向不同方向转移的不同运动特征：相反的手臂。旋转视觉条件下训练改善了右臂运动的初始方向，而对臂训练改善了最终位置精度，但没有改善左臂运动的方向。这些发现证实，训练的转移并不是由于一般的认知策略，因为这种效果应该平等地影响两只手。这些发现支持这样的假设：每个手臂控制器都可以访问在对侧手臂训练期间学到的信息。我们建议每个控制器根据其指定特定运动特征的熟练程度以不同的方式使用此信息。我们讨论的证据表明，控制的这两个方面是由左右大脑半球差异介导的。
Previous findings from our laboratory support the idea that the dominant arm is more proficient than the non-dominant arm in coordinating intersegmental dynamics for specifying trajectory direction and shape during multijoint reaching movements. We also showed that adaptation of right and left arms to novel visuomotor rotations was equivalent, suggesting that this process occurs upstream to processes that distinguish dominant and non-dominant arm performance. Because of this, we speculate that such visuomotor adaptations might transfer to subsequent performance during adaptation with the other arm. We now examine whether opposite arm training to novel visuomotor rotations transfers to affect adaptation using the right and left arms. Two subject groups, RL and LR, each comprising seven right-handed subjects, adapted to a 30degrees counterclockwise rotation in the visual display during a center-out reaching task performed in eight directions. Each group first adapted using either the right (RL) or left (LR) arm, followed by opposite arm adaptation. In order to assess transfer, we compared the same side arm movements (either right or left) following opposite arm adaptation to those performed prior to opposite arm adaptation. Our findings indicate unambiguous transfer of learning across the arms. Different features of movement transferred in different directions: Opposite arm. training improved the initial direction of right arm movements under the rotated visual condition, whereas opposite arm training improved the final position accuracy, but not the direction of left arm movements. These findings confirm that transfer of training was not due to a general cognitive strategy, since such an effect should influence either hand equally. These findings support the hypothesis that each arm controller has access to information learned during opposite arm training. We suggest that each controller uses this information differently, depending on its proficiency for specifying particular features of movement. We discuss evidence that these two aspects of control are differentially mediated by the right and left cerebral hemispheres.