Relevance of Error: What Drives Motor Adaptation?
Relevance of Error: What Drives Motor Adaptation?
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DOI：
10.1152/jn.90545.2008
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发表时间：
2009-02-01
影响因子：
2.5
通讯作者：
Koerding, Konrad
中科院分区：
文献类型：
--
作者：
Wei, Kunlin;Koerding, Konrad
Wei K，Kording K.错误的相关性：是什么驱动了运动适应？神经生理学杂志101：655-664，2009年。首次发表于2008年11月19日; doi：10.1152/jn.90545.2008。在运动适应过程中，神经系统不断地使用错误信息来改善未来的运动。今天的主流模型简单地假设神经系统线性地、成比例地适应错误。然而，并不是所有的动作错误都与我们自己的动作有关。环境可能会短暂地干扰运动的产生，例如，一阵风将网球吹离其预期轨迹。显然，神经系统不应该在随后的网球击球中根据这种不相关的运动错误调整其运动计划。我们假设神经系统估计每个观察到的错误的相关性，并强烈适应相关的错误。在这里，我们提出了一个贝叶斯处理这个问题。该模型计算错误与电机厂相关的可能性，并推导出理想的适应策略，以实现最精确的运动。该模型预测，适应应该是一个误差大小的非线性函数。在达成的实验中，我们发现了强有力的证据，预测的非线性策略。该模型还解释了有关扫视增益适应，适应视觉旋转和力扰动的已发表数据。我们的研究表明，神经系统不断地、毫不费力地估计所观察到的运动错误与成功的运动适应的相关性。
Wei K, Kording K. Relevance of error: what drives motor adaptation? J Neurophysiol 101: 655-664, 2009. First published November 19, 2008; doi:10.1152/jn.90545.2008. During motor adaptation the nervous system constantly uses error information to improve future movements. Today's mainstream models simply assume that the nervous system adapts linearly and proportionally to errors. However, not all movement errors are relevant to our own action. The environment may transiently disturb the movement production-for example, a gust of wind blows the tennis ball away from its intended trajectory. Apparently the nervous system should not adapt its motor plan in the subsequent tennis strokes based on this irrelevant movement error. We hypothesize that the nervous system estimates the relevance of each observed error and adapts strongly only to relevant errors. Here we present a Bayesian treatment of this problem. The model calculates how likely an error is relevant to the motor plant and derives an ideal adaptation strategy that leads to the most precise movements. This model predicts that adaptation should be a nonlinear function of the size of an error. In reaching experiments we found strong evidence for the predicted nonlinear strategy. The model also explains published data on saccadic gain adaptation, adaptation to visuomotor rotations, and force perturbations. Our study suggests that the nervous system constantly and effortlessly estimates the relevance of observed movement errors for successful motor adaptation.