Episodic memory (EM) is classically conceived as a memory for events, localized in space and time, and characterized by autonoetic consciousness (ANC) allowing to mentally travel back in time and subjectively relive an event. Building on recent evidence that the first-person visual co-perception of one's own body during encoding impacts EM, we used a scene recognition task in immersive virtual reality (VR) and measured how first-person body view would modulate peri-encoding resting-state fMRI, EM performance, and ANC. Specifically, we investigated the impact of body view on post-encoding functional connectivity in an a priori network of regions related either to EM or multisensory bodily processing and used these regions in a seed-to-whole brain analysis. Post-encoding connectivity between right hippocampus (rHC) and right parahippocampus (rPHC) was enhanced when participants encoded scenes while seeing their body. Moreover, the strength of connectivity between the rHC, rPHC and the neocortex displayed two main patterns with respect to body view. The connectivity with a sensorimotor fronto-parietal network, comprising primary somatosensory and primary motor cortices, correlated with ANC after - but not before - encoding, depending on body view. The opposite change of connectivity was found between rHC, rPHC and the medial parietal cortex (from being correlated with ANC before encoding to an absence of correlation after encoding), but irrespective of body view. Linking immersive VR and fMRI for the study of EM and ANC, these findings suggest that seeing one's own body during encoding impacts the brain activity related to EM formation by modulating the connectivity between the right hippocampal formation and the neocortical regions involved in the processing of multisensory bodily signals and self-consciousness.

中文翻译：

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第一人称身体视角调节情景记忆和自主意识的神经基础：一项功能连接研究

情景记忆 (EM) 经典地被认为是对事件的记忆，定位于空间和时间，并以自主意识 (ANC) 为特征，允许在精神上回到过去并主观地重温事件。基于最近的证据表明编码期间自己身体的第一人称视觉共同感知会影响 EM，我们在沉浸式虚拟现实 (VR) 中使用了场景识别任务，并测量了第一人称身体视图将如何调节编码周围的静止-状态 fMRI、EM 性能和 ANC。具体来说，我们研究了身体视图对与 EM 或多感官身体处理相关的区域的先验网络中编码后功能连接的影响，并在种子到全脑分析中使用这些区域。当参与者在看到自己的身体时编码场景时，右侧海马体 (rHC) 和右侧海马体 (rPHC) 之间的编码后连接性得到增强。此外，rHC、rPHC 和新皮质之间的连接强度在身体视图方面显示出两种主要模式。与感觉运动额顶叶网络的连接，包括初级躯体感觉和初级运动皮层，在编码之后（但不是之前）与 ANC 相关，具体取决于身体视图。在 rHC、rPHC 和内侧顶叶皮层之间发现了相反的连接变化（从编码前与 ANC 相关到编码后没有相关性），但与身体视图无关。将沉浸式 VR 和 fMRI 联系起来以研究 EM 和 ANC，这些发现表明