Centre for Studies and Research in Cognitive Neuroscience, Department of Psychology, University of Bologna, Via Rasi e Spinelli 176, 47521, Cesena (FC), Italy.
MOMILab, IMT School for Advanced Studies Lucca, Lucca, Italy.
Cogn Process. 2024 Feb;25(1):121-132. doi: 10.1007/s10339-023-01154-0. Epub 2023 Sep 1.
We experience our self as a body located in space. However, how information about self-location is integrated into multisensory processes underlying the representation of the peripersonal space (PPS), is still unclear. Prior studies showed that the presence of visual information related to oneself modulates the multisensory processes underlying PPS. Here, we used the crossmodal congruency effect (CCE) to test whether this top-down modulation depends on the spatial location of the body-related visual information. Participants responded to tactile events on their bodies while trying to ignore a visual distractor presented on the mirror reflection of their body (Self) either in the peripersonal space (Near) or in the extrapersonal space (Far). We found larger CCE when visual events were presented on the mirror reflection in the peripersonal space, as compared to the extrapersonal space. These results suggest that top-down modulation of the multisensory bodily self is only possible within the PPS.
我们将自己体验为一个位于空间中的身体。然而，关于自我位置的信息如何与代表个人空间 (PPS) 的多感觉过程整合在一起，目前还不清楚。先前的研究表明，与自身相关的视觉信息的存在会调节 PPS 下的多感觉过程。在这里，我们使用跨模态一致性效应 (CCE) 来测试这种自上而下的调制是否取决于与身体相关的视觉信息的空间位置。参与者在尝试忽略呈现在身体镜像反射上的视觉干扰物（自我）的同时，对身体上的触觉事件做出反应，该干扰物位于个人空间（近）或外部空间（远）。当视觉事件出现在个人空间的镜像反射上时，我们发现 CCE 更大，而当视觉事件出现在外部空间的镜像反射上时，CCE 则更小。这些结果表明，多感觉身体自我的自上而下的调制仅在 PPS 内才有可能。
