Sub-optimality in motor planning is not improved by explicit observation of motor uncertainty
Sub-optimality in motor planning is not improved by explicit observation of motor uncertainty
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DOI：
10.1038/s41598-019-50901-x
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发表时间：
2019-10-16
影响因子：
4.6
通讯作者：
Kudo, Kazutoshi
中科院分区：
文献类型：
--
作者：
Ota, Keiji;Shinya, Masahiro;Kudo, Kazutoshi
为了在风险下做出最佳决策，人们必须通过获得奖励和惩罚的概率来正确权衡潜在的奖励和惩罚。在运动决策任务中，结果的不确定性是运动不确定性的结果。当参与者像他们在这类任务中经常做的那样表现得次优时，可能是因为他们对自己的运动不确定性信息不足：有了更多的信息，他们的表现可以在学习自己的运动不确定性时收敛到最佳状态。或者，它们的次优性能可能反映出它们无法利用所拥有的信息，甚至无法执行正确的计算。为了区分这两种可能性，我们进行了为期两天的实验。在第一天，所有的参与者都完成了一项接触任务，并对运动错误进行了逐次反馈。在一天结束的时候，他们的瞄准点通常仍然不是最理想的。第二天，参与者被分成两组，一组重复第一天的任务，另一组重复第一天的任务，但间歇性地得到额外的信息，总结他们的运动错误。接受额外信息的参与者并没有比那些没有接受额外信息的参与者表现得更好。
To make optimal decisions under risk, one must correctly weight potential rewards and penalties by the probabilities of receiving them. In motor decision tasks, the uncertainty in outcome is a consequence of motor uncertainty. When participants perform suboptimally as they often do in such tasks, it could be because they have insufficient information about their motor uncertainty: with more information, their performance could converge to optimal as they learn their own motor uncertainty. Alternatively, their suboptimal performance may reflect an inability to make use of the information they have or even to perform the correct computations. To discriminate between these two possibilities, we performed an experiment spanning two days. On the first day, all participants performed a reaching task with trial-by-trial feedback of motor error. At the end of the day, their aim points were still typically suboptimal. On the second day participants were divided into two groups one of which repeated the task of the first day and the other of which repeated the task but were intermittently given additional information summarizing their motor errors. Participants receiving additional information did not perform significantly better than those who did not.