Department of Psychology, Royal Holloway, University of London, Egham, Surrey, UK.
Neuropsychologia. 2010 Jul;48(9):2740-9. doi: 10.1016/j.neuropsychologia.2010.05.021. Epub 2010 May 25.
The exact relation between the sense that one's body is one's own (body-ownership) and the sense that one controls one's own bodily actions (agency) has been the focus of much speculation, but remains unclear. On an 'additive' model, agency and body-ownership are strongly related; the ability to control actions is a powerful cue to body-ownership. This view implies a component common to the senses of body-ownership and agency, plus possible additional components unique to agency. An alternative 'independence' model holds that agency and body-ownership are qualitatively different experiences, triggered by different inputs, and recruiting distinct brain networks. We tested these two specific models by investigating the sensory and motor aspects of body-representation in the brain using fMRI. Activations in midline cortical structures were associated with a sensory-driven sense of body-ownership, and were absent in agency conditions. Activity in the pre-SMA was linked to the sense of agency, but distinct from the sense of body-ownership. No shared activations that would support the additive model were found. The results support the independence model. Body-ownership involves a psychophysiological baseline, linked to activation of the brain's default mode network. Agency is linked to premotor and parietal areas involved in generating motor intentions and subsequent action monitoring.
自我身体拥有感（身体所有权）和自我控制身体动作感（能动性）之间的确切关系一直是许多推测的焦点，但仍不清楚。在“附加”模型中，能动性和身体所有权密切相关；控制动作的能力是身体所有权的有力线索。这种观点暗示了身体所有权和能动性感觉共同的组成部分，加上可能独特于能动性的附加组成部分。另一种“独立性”模型认为，能动性和身体所有权是不同质的体验，由不同的输入触发，并招募不同的大脑网络。我们使用 fMRI 研究了大脑中身体表现的感觉和运动方面，以此来测试这两个具体模型。中线上皮质结构的激活与感官驱动的身体所有权感觉有关，而在能动性条件下则不存在。前 SMA 的活动与能动性的感觉有关，但与身体所有权的感觉不同。没有发现支持附加模型的共享激活。结果支持独立性模型。身体所有权涉及与大脑默认模式网络激活相关的心理生理基线。能动性与参与产生运动意图和随后的动作监测的运动前区和顶叶区有关。
