Trial-by-trial transformation of error into sensorimotor adaptation changes with environmental dynamics
Trial-by-trial transformation of error into sensorimotor adaptation changes with environmental dynamics
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DOI：
10.1152/jn.00196.2007
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发表时间：
2007-09-01
影响因子：
2.5
通讯作者：
Thoroughman, Kurt A.
中科院分区：
文献类型：
--
作者：
Fine, Michael S.;Thoroughman, Kurt A.
人类可以迅速改变他们的运动输出，在新的环境中进行目标导向的伸展运动。长期以来，描述这种自适应过程的理论一直假定自适应步骤与误差成比例。在这里，我们表明，在执行一个新的达到任务，参与者没有采用固定的学习规则，而是修改他们的适应性反应的基础上的统计特性的运动环境。我们发现，随着力分布的方向偏差从强偏差转变为无偏差，参与者从与误差成比例的适应过程转变为适应误差的方向而不是幅度的过程。参与者还修改了他们的反应，因为扰动的可能性改变;随着可能性从80%下降到20%的试验，参与者采取了越来越不成比例的策略。我们认为，人们可以在经历新环境的几分钟内快速切换学习过程。
Humans can rapidly change their motor output to make goal-directed reaching movements in a new environment. Theories that describe this adaptive process have long presumed that adaptive steps scale proportionally with error. Here we show that while performing a novel reaching task, participants did not adopt a fixed learning rule, but instead modified their adaptive response based on the statistical properties of the movement environment. We found that as the directional bias of the force distribution shifted from strongly biased to unbiased, participants transitioned from an adaptive process that scaled proportionally with error to one that adapted to the direction, but not magnitude, of error. Participants also modified their response as the likelihood of the perturbation changed; as the likelihood decreased from 80 to 20% of trials, participants adopted an increasingly disproportional strategy. We propose that people can rapidly switch between learning processes within minutes of experiencing a novel environment.