Spontaneous imitative movements induced by an illusory embodied fake hand
Spontaneous imitative movements induced by an illusory embodied fake hand
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DOI：
10.1016/j.neuropsychologia.2018.01.023
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发表时间：
2018-03-01
期刊：
影响因子：
2.6
通讯作者：
Ohki, Yukari
中科院分区：
文献类型：
--
作者：
Shibuya, Satoshi;Unenaka, Satoshi;Ohki, Yukari
在橡胶手错觉（RHI）中，当隐藏的真手和可见的假手被同步抚摸时，个人将假手感知为自己的手。几项 RHI 研究报告称，对所体现的假手的视觉操纵会反向影响观察者自己的手的感知处理（例如热或疼痛敏感性）。在这项研究中，我们检查了假手的运动操纵是否会同样影响观察者的运动系统。我们的研究采用了一种新颖的 RHI 范式，其中在测量脑电图 (EEG) 时，假手的意外运动（即手指张开）会打断抚摸。我们发现，仅在 RHI（同步）会话中，参与者经常会根据假手的运动自发地移动双手。脑电图分析显示，在观察假手运动期间，运动系统的神经激活（mu-节奏去同步）增强。此外，同步条件下的运动激活比异步条件下更大，并且与假手的身体所有权感显着相关。这些发现为“运动反向投射”提供了强有力的行为和神经生理学证据，其中虚幻的身体部分的运动被反向转移到观察者的感觉运动系统。
In the rubber hand illusion (RHI), individuals perceive a fake hand as their own when the hidden real hand and visible fake hand are synchronously stroked. Several RHI studies have reported that visual manipulation of the embodied fake hand inversely affects the perceptual processing of the observer's own hand (e.g., thermal or pain sensitivity). In this study, we examined whether motor manipulation of the fake hand similarly affects the observer's motor system. Our study employed a novel RHI paradigm wherein stroking was interrupted by unexpected movement of the fake hand (i.e., finger spreading) while measuring electroencephalography (EEG). We found that participants often spontaneously moved their hands in accordance with the movement of the fake hand only in the RHI (synchronous) sessions. EEG analyses revealed enhanced neural activation (mu-rhythm desynchronization) of the motor system during observation of the fake hand movement. Moreover, motor activation was greater in the synchronous than in the asynchronous condition and significantly correlated with the feeling of body ownership over the fake hand. These findings provide strong behavioral and neurophysiological evidence of 'motor back projection', in which the movement of an illusory embodied body part is inversely transferred to the sensorimotor system of the observer.