Eliminating mirror responses by instructions
Eliminating mirror responses by instructions
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DOI：
10.1016/j.cortex.2015.04.018
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发表时间：
2015-09-01
期刊：
影响因子：
3.6
通讯作者：
Brass, Marcel
中科院分区：
文献类型：
--
作者：
Bardi, Lara;Bundt, Carsten;Brass, Marcel
对动作的观察导致观察者体内相应的运动计划被激活。这种运动共振现象在社会互动中具有重要作用，可以促进模仿、学习和理解动作。然而，镜像反应并不总是对我们的行为有积极的影响。自动模仿他人的倾向可能会干扰动作的执行，而非模仿或相反的反应在某些情况下具有优势。先前的研究表明，在大量练习后或在互补的联合作用情况下，镜像倾向可以被抑制，这表明镜像反应比之前认为的更灵活。本研究的目的是深入了解运动镜像反应灵活性的机制。在这里，我们表明，仅仅是反向模仿映射的指令就会改变镜像反应，这是由经颅磁刺激(TMS)诱导的运动诱发电位(MEPS)增强所指示的。重要的是，当参与者在没有机会执行任务的情况下，被动地观察手指的运动时，镜子的激活被测量出来。这一结果表明，任务指令的执行激活了刺激-反应关联，从而可以覆盖镜像表征。我们的结果揭示了一个关键的机制，它可能允许在不同的背景下灵活地调整镜像反应。对这一结果的影响进行了讨论。(C)2015爱思唯尔有限公司。保留所有权利。
The observation of an action leads to the activation of the corresponding motor plan in the observer. This phenomenon of motor resonance has an important role in social interaction, promoting imitation, learning and action understanding. However, mirror responses not always have a positive impact on our behavior. An automatic tendency to imitate others can introduce interference in action execution and non-imitative or opposite responses have an advantage in some contexts. Previous studies suggest that mirror tendencies can be suppressed after extensive practice or in complementary joint action situations revealing that mirror responses are more flexible than previously thought. The aim of the present study was to gain insight into the mechanisms that allow response flexibility of motor mirroring. Here we show that the mere instruction of a counter-imitative mapping changes mirror responses as indexed by motor evoked potentials (MEPs) enhancement induced by transcranial magnetic stimulation (TMS). Importantly, mirror activation was measured while participants were passively watching finger movements, without having the opportunity to execute the task. This result suggests that the implementation of task instructions activates stimulus-response association that can overwrite the mirror representations. Our outcome reveals one of the crucial mechanisms that might allow flexible adjustments of mirror responses in different contexts. The implications of this outcome are discussed. (C) 2015 Elsevier Ltd. All rights reserved.