Parallel specification of competing sensorimotor control policies for alternative action options.

Parallel specification of competing sensorimotor control policies for alternative action options.
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DOI:
10.1038/nn.4214
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发表时间:
2016-02
影响因子:
25
通讯作者:
Flanagan JR
Flanagan JR
中科院分区:
医学1区
文献类型:
--
作者:
Gallivan JP;Logan L;Wolpert DM;Flanagan JR

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最近的理论提出,当大脑面临几种可能的动作时,在决定它们之前,它会准备好多种竞争性的动作。到目前为止,心理物理学支持这一想法的证据来自快速达到任务,其中个人,在目标不确定的情况下,在竞争目标之间发起初始运动,与同时执行的多个准备达到一致。然而,到达规划涉及的远不止指定运动方向;它需要指定感觉运动控制策略,该策略设置反馈增益,从而塑造运动系统如何响应由噪声或扰动引起的错误。在这里,我们表明,达到多个潜在目标的反馈增益对应于平均的试验中,目标是已知的。这些发现提供的证据表明,当大脑面临多个行动选项时,在制定其中一个之前,会并行计算多个相互竞争的感觉运动控制策略。
Recent theory proposes that the brain, when confronted with several action possibilities, prepares multiple competing movements in advance of deciding between them. To date, psychophysical supporting evidence for this idea comes from rapid reaching tasks in which individuals, under cases of target uncertainty, launch initial movements in between competing targets, consistent with multiple prepared reaches being executed simultaneously. Reach planning, however, involves far more than specifying movement direction(s); it requires the specification of sensorimotor control policies that set feedback gains shaping how the motor system responds to errors induced by noise or perturbations. Here we show that the feedback gains for reaches toward multiple potential targets correspond to an average of the gains on trials in which the targets are known in advance. These findings provide evidence that the brain, when presented with multiple action options, computes multiple competing sensorimotor control policies in parallel prior to instituting one of them.
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