Visuomotor adaptation needs a validation of prediction error by feedback error.
Visuomotor adaptation needs a validation of prediction error by feedback error.
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Visuomotor适应需要通过反馈错误验证预测错误。
DOI：
10.3389/fnhum.2014.00880
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发表时间：
2014
影响因子：
2.9
通讯作者：
Priot AE
中科院分区：
文献类型：
--
作者：
Gaveau V;Prablanc C;Laurent D;Rossetti Y;Priot AE
视觉运动对视野转移的适应所引起的短期可塑性背后的过程仍然存在争议。两个主要的误差来源可以诱导运动适应：到达反馈误差，这对应于视觉上感知到的手和目标位置之间的差异，以及预测和实际视觉参照之间的误差。这两个误差源是紧密交织在一起的，很难分开，因为目标和到达的肢体是同时可见的。因此，本研究的目的是澄清这两种类型的误差相对贡献在一个指向任务在棱镜移位视觉。在“末端反馈误差”条件下，被试只允许在运动端观看手，同时观看目标。在“运动预测误差”条件下，在没有任何视觉目标的情况下，对手的观察仅限于运动持续时间，并且错误信号仅来自手的预测参考和实际参考的比较。为了防止故意的误差修正，使用阈下逐步增加棱镜偏差，使受试者在两种情况下都不知道应用的视觉偏差。仅在“末端反馈误差”条件下观察到自适应后效。在被试不知道光学偏差和自赋指向误差的情况下，仅凭预测误差不足以诱导适应。这些结果表明手对目标反馈误差信号在视觉运动适应中起关键作用；与最近的神经生理学发现一致，他们认为反馈和预测误差信号的结合对于引起后遗症是必要的。他们还认为，当视觉扰动逐渐引入，认知因素被消除或强烈减弱时，反馈误差会更新参考的预测。
The processes underlying short-term plasticity induced by visuomotor adaptation to a shifted visual field are still debated. Two main sources of error can induce motor adaptation: reaching feedback errors, which correspond to visually perceived discrepancies between hand and target positions, and errors between predicted and actual visual reafferences of the moving hand. These two sources of error are closely intertwined and difficult to disentangle, as both the target and the reaching limb are simultaneously visible. Accordingly, the goal of the present study was to clarify the relative contributions of these two types of errors during a pointing task under prism-displaced vision. In “terminal feedback error” condition, viewing of their hand by subjects was allowed only at movement end, simultaneously with viewing of the target. In “movement prediction error” condition, viewing of the hand was limited to movement duration, in the absence of any visual target, and error signals arose solely from comparisons between predicted and actual reafferences of the hand. In order to prevent intentional corrections of errors, a subthreshold, progressive stepwise increase in prism deviation was used, so that subjects remained unaware of the visual deviation applied in both conditions. An adaptive aftereffect was observed in the “terminal feedback error” condition only. As far as subjects remained unaware of the optical deviation and self-assigned pointing errors, prediction error alone was insufficient to induce adaptation. These results indicate a critical role of hand-to-target feedback error signals in visuomotor adaptation; consistent with recent neurophysiological findings, they suggest that a combination of feedback and prediction error signals is necessary for eliciting aftereffects. They also suggest that feedback error updates the prediction of reafferences when a visual perturbation is introduced gradually and cognitive factors are eliminated or strongly attenuated.
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