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No evidence for somatosensory attenuation during action observation of self-touch
European Journal of Neuroscience ( IF 2.7 ) Pub Date : 2021-08-31 , DOI: 10.1111/ejn.15436
Konstantina Kilteni 1 , Patrick Engeler 1 , Ida Boberg 1 , Linnea Maurex 1 , H Henrik Ehrsson 1
Affiliation  

The discovery of mirror neurons in the macaque brain in the 1990s triggered investigations on putative human mirror neurons and their potential functionality. The leading proposed function has been action understanding: Accordingly, we understand the actions of others by ‘simulating’ them in our own motor system through a direct matching of the visual information to our own motor programmes. Furthermore, it has been proposed that this simulation involves the prediction of the sensory consequences of the observed action, similar to the prediction of the sensory consequences of our executed actions. Here, we tested this proposal by quantifying somatosensory attenuation behaviourally during action observation. Somatosensory attenuation manifests during voluntary action and refers to the perception of self-generated touches as less intense than identical externally generated touches because the self-generated touches are predicted from the motor command. Therefore, we reasoned that if an observer simulates the observed action and, thus, he/she predicts its somatosensory consequences, then he/she should attenuate tactile stimuli simultaneously delivered to his/her corresponding body part. In three separate experiments, we found a systematic attenuation of touches during executed self-touch actions, but we found no evidence for attenuation when such actions were observed. Failure to observe somatosensory attenuation during observation of self-touch is not compatible with the hypothesis that the putative human mirror neuron system automatically predicts the sensory consequences of the observed action. In contrast, our findings emphasize a sharp distinction between the motor representations of self and others.

中文翻译:

在自我触摸的动作观察过程中没有体感衰减的证据

1990 年代猕猴大脑中镜像神经元的发现引发了对假定的人类镜像神经元及其潜在功能的研究。主要提出的功能是动作理解:因此,我们通过将视觉信息与我们自己的运动程序直接匹配,在我们自己的运动系统中“模拟”他人的动作,从而理解他人的动作。此外,有人提出这种模拟涉及对观察到的动作的感官后果的预测,类似于对我们执行的动作的感官后果的预测。在这里,我们通过在动作观察期间从行为上量化体感衰减来测试该提议。体感衰减出现在自主动作期间,是指对自发触摸的感知不如相同的外部产生的触摸强烈,因为自发触摸是根据运动命令预测的。因此,我们推断,如果观察者模拟观察到的动作,从而预测其体感结果,那么他/她应该减弱同时传递到他/她相应身体部位的触觉刺激。在三个独立的实验中,我们发现在执行的自触摸动作期​​间触摸会发生系统衰减,但是当观察到此类动作时,我们没有发现衰减的证据。在观察自我触摸过程中未能观察到体感衰减与假定的人类镜像神经元系统自动预测观察到的动作的感觉结果的假设不符。相比之下,我们的发现强调了自我和他人的运动表征之间的明显区别。
更新日期:2021-10-20
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