Causal Dynamics of Scalp Electroencephalography Oscillation During the Rubber Hand Illusion
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- 作者：Noriaki Kanayama ; Alberto Morandi ; Kazuo Hiraki ; Francesco Pavani
- 关键词：Rubber hand illusion ; Electroencephalography ; Causal relationship ; Body ownership
- 刊名：Brain Topography
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：30
- 期：1
- 页码：122-135
- 全文大小：
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Neurosciences; Psychiatry; Neurology;
- 出版者：Springer US
- ISSN：1573-6792
- 卷排序：30
文摘
Rubber hand illusion (RHI) is an important phenomenon for the investigation of body ownership and self/other distinction. The illusion is promoted by the spatial and temporal contingencies of visual inputs near a fake hand and physical touches to the real hand. The neural basis of this phenomenon is not fully understood. We hypothesized that the RHI is associated with a fronto-parietal circuit, and the goal of this study was to determine the dynamics of neural oscillation associated with this phenomenon. We measured electroencephalography while delivering spatially congruent/incongruent visuo-tactile stimulations to fake and real hands. We applied time–frequency analyses and calculated renormalized partial directed coherence (rPDC) to examine cortical dynamics during the bodily illusion. When visuo-tactile stimulation was spatially congruent, and the fake and real hands were aligned, we observed a reduced causal relationship from the medial frontal to the parietal regions with respect to baseline, around 200 ms post-stimulus. This change in rPDC was negatively correlated with a subjective report of the RHI intensity. Moreover, we observed a link between the proprioceptive drift and an increased causal relationship from the parietal cortex to the right somatosensory cortex during a relatively late period (550–750 ms post-stimulus). These findings suggest a two-stage process in which (1) reduced influence from the medial frontal regions over the parietal areas unlocks the mechanisms that preserve body integrity, allowing RHI to emerge; and (2) information processed at the parietal cortex is back-projected to the somatosensory cortex contralateral to the real hand, inducing proprioceptive drift.