Tsakiris Manos, Hesse Maike D, Boy Christian, Haggard Patrick, Fink Gereon R
Wellcome Department of Imaging Neuroscience, Institute of Neurology, University College London, London, UK.
Cereb Cortex. 2007 Oct;17(10):2235-44. doi: 10.1093/cercor/bhl131. Epub 2006 Nov 30.
Body ownership refers to the special perceptual status of one's own body, which makes bodily sensations seem unique to oneself. We studied the neural correlates of body ownership by controlling whether an external object was accepted as part of the body or not. In the rubber hand illusion (RHI), correlated visuotactile stimulation causes a fake hand to be perceived as part of one's own body. In the present study, we distinguished between the causes (i.e., multisensory stimulation) and the effect (i.e., the feeling of ownership) of the RHI. Participants watched a right or a left rubber hand being touched either synchronously or asynchronously with respect to their own unseen right hand. A quantifiable correlate of the RHI is a shift in the perceived position of the subject's hand toward the rubber hand. We used positron emission tomography to identify brain areas whose activity correlated with this proprioceptive measure of body ownership. Body ownership was related to activity in the right posterior insula and the right frontal operculum. Conversely, when the rubber hand was not attributed to the self, activity was observed in the contralateral parietal cortex, particularly the somatosensory cortex. These structures form a network that plays a fundamental role in linking current sensory stimuli to one's own body and thus also in self-consciousness.
身体所有权是指个体自身身体的特殊感知状态，这种状态使得身体感觉对个体而言显得独特。我们通过控制外部物体是否被接受为身体的一部分来研究身体所有权的神经关联。在橡皮手错觉（RHI）中，相关的视觉触觉刺激会使假手被感知为自身身体的一部分。在本研究中，我们区分了橡皮手错觉的成因（即多感官刺激）和结果（即所有权感觉）。参与者观看一只右手或左手橡皮手，其被触摸的时间与他们自己未被看到的右手同步或异步。橡皮手错觉的一个可量化关联是受试者手部的感知位置向橡皮手的偏移。我们使用正电子发射断层扫描来识别与这种身体所有权的本体感觉测量相关的脑区。身体所有权与右侧后岛叶和右侧额下回的活动有关。相反，当橡皮手不被归为自我所有时，在对侧顶叶皮层，特别是体感皮层中观察到了活动。这些结构形成了一个网络，在将当前感觉刺激与个体自身身体联系起来方面发挥着基本作用，因此在自我意识中也起着基本作用。
