IMPACT OF ONLINE VISUAL FEEDBACK ON MOTOR ACQUISITION AND RETENTION WHEN LEARNING TO REACH IN A FORCE FIELD
IMPACT OF ONLINE VISUAL FEEDBACK ON MOTOR ACQUISITION AND RETENTION WHEN LEARNING TO REACH IN A FORCE FIELD
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DOI：
10.1016/j.neuroscience.2016.09.020
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发表时间：
2016-11-19
期刊：
影响因子：
3.3
通讯作者：
Mercier, C.
中科院分区：
文献类型：
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作者：
Batcho, C. S.;Gagne, M.;Mercier, C.
当受试者学习一个新的运动任务时，几个反馈源（本体感受，视觉或听觉）有助于表现。在过去的几年里，一些研究调查了视觉反馈在运动学习中的作用，但证据仍然相互矛盾。因此，本研究的目的是调查的作用，在线视觉反馈（VFb）的收购和保留阶段的运动学习与培训，在达到任务。30名健康受试者使用机器人外骨骼（KINARM）连续2天用他们的优势手臂向两个目标进行弹道式伸展运动。他们被随机分配到一组（VFb）或无（NoVFb）VFb的索引位置在运动过程中。在第1天，在应用速度依赖性阻力力场（适应）之前（基线）和期间执行任务。为了评估保留，参与者在第2天重复了力场任务。运动学习的特征在于：（1）最终终点误差（运动准确度）和（2）偏离的初始角度（iANG）（运动规划）。尽管两组都表现出运动适应，但NoVFB组的学习速度比VFB组慢，最终终点错误率也比VFB组高。在某些情况下，没有视觉反馈的训练对象使用更弯曲的初始轨迹来预测扰动。这一观察结果表明，即使在反馈有限的情况下，学习在速度依赖的阻力力场中达到目标也是可能的。然而，VFb的缺乏导致了不同的策略，这些策略只有在达到最具挑战性的目标时才明显。(C)2016作者由Elsevier Ltd代表IBRO出版。
When subjects learn a novel motor task, several sources of feedback (proprioceptive, visual or auditory) contribute to the performance. Over the past few years, several studies have investigated the role of visual feedback in motor learning, yet evidence remains conflicting. The aim of this study was therefore to investigate the role of online visual feedback (VFb) on the acquisition and retention stages of motor learning associated with training in a reaching task. Thirty healthy subjects made ballistic reaching movements with their dominant arm toward two targets, on 2 consecutive days using a robotized exoskeleton (KINARM). They were randomly assigned to a group with (VFb) or without (NoVFb) VFb of index position during movement. On day 1, the task was performed before (baseline) and during the application of a velocity-dependent resistive force field (adaptation). To assess retention, participants repeated the task with the force field on day 2. Motor learning was characterized by: (1) the final endpoint error (movement accuracy) and (2) the initial angle (iANG) of deviation (motor planning). Even though both groups showed motor adaptation, the NoVFb-group exhibited slower learning and higher final endpoint error than the VFb-group. In some condition, subjects trained without visual feedback used more curved initial trajectories to anticipate for the perturbation. This observation suggests that learning to reach targets in a velocity-dependent resistive force field is possible even when feedback is limited. However, the absence of VFb leads to different strategies that were only apparent when reaching toward the most challenging target. (C) 2016 The Authors. Published by Elsevier Ltd on behalf of IBRO.