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双侧中央沟盖处理心跳感知反映了身体自我意识的变化。

Bilateral Rolandic operculum processing underlying heartbeat awareness reflects changes in bodily self-consciousness.

作者信息

Blefari Maria Laura, Martuzzi Roberto, Salomon Roy, Bello-Ruiz Javier, Herbelin Bruno, Serino Andrea, Blanke Olaf

机构信息

Center for Neuroprosthetics, École Polytechnique Fédérale de Lausanne, Campus Biotech, Chemin des Mines 9, 1202, Geneva, Switzerland.

Laboratory of Cognitive Neuroscience, Brain Mind Institute, School of Life Sciences, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.

出版信息

Eur J Neurosci. 2017 May;45(10):1300-1312. doi: 10.1111/ejn.13567. Epub 2017 May 4.

Abstract

Exteroceptive bodily signals (including tactile, proprioceptive and visual signals) are important information contributing to self-consciousness. Moreover, prominent theories proposed that visceral signals about internal bodily states are equally or even more important for self-consciousness. Neuroimaging studies have described several brain regions which process signals related to bodily self-consciousness (BSC) based on the integration of exteroceptive signals (e.g. premotor cortex, angular gyrus, supramarginal gyrus and extrastriate body area), and that another brain region, the insula/operculum which is involved in interoception and interoceptive awareness, processes signals critical for self-awareness. Providing evidence for the integration of exteroceptive and interoceptive bodily signals, recent behavioral experiments have demonstrated that the manipulation of interoceptive (e.g. cardiac) signals, coupled with exteroceptive (e.g. visual) signals, also modulates BSC. Does this integration occur within or outside the structures described above? To this end, we adapted a recently designed protocol that uses cardio-visual stimulation to induce altered states of BSC to fMRI. Additionally, we measured neural activity in a classical interoceptive task. We found six brain regions (bilateral Rolandic operculum, bilateral supramarginal gyrus, right frontal inferior operculum and left temporal superior gyrus) that were activated differently during the interoception task as opposed to a control task. The brain regions which showed the highest selectivity for BSC based on our cardio-visual manipulation were found in the bilateral Rolandic operculum. Given our findings, we propose that the Rolandic operculum processes integrated exteroceptive-interoceptive signals that are necessary for interoceptive awareness as well as BSC.

摘要

外部身体信号(包括触觉、本体感觉和视觉信号)是有助于自我意识的重要信息。此外,一些著名理论提出,关于身体内部状态的内脏信号对自我意识同样重要甚至更为重要。神经影像学研究已经描述了几个基于外部感觉信号整合来处理与身体自我意识(BSC)相关信号的脑区(例如运动前皮质、角回、缘上回和外侧枕叶体区),并且另一个参与内感受和内感受觉知的脑区——脑岛/岛盖,处理对自我意识至关重要的信号。最近的行为实验为外部感觉和内部感觉身体信号的整合提供了证据,这些实验表明,对内感受(如心脏)信号与外部感觉(如视觉)信号的操控,也会调节身体自我意识。这种整合是发生在上述结构之内还是之外呢?为此,我们采用了一种最近设计的方案,该方案使用心脏-视觉刺激来诱导身体自我意识的改变状态,并将其应用于功能磁共振成像(fMRI)。此外,我们在一个经典的内感受任务中测量了神经活动。我们发现六个脑区(双侧中央前回岛盖、双侧缘上回、右侧额下回岛盖和左侧颞上回)在与对照任务相比的内感受任务中被不同程度地激活。基于我们的心脏-视觉操控,对身体自我意识表现出最高选择性的脑区位于双侧中央前回岛盖。基于我们的研究结果,我们提出中央前回岛盖处理整合的外部感觉-内部感觉信号,这些信号对于内感受觉知以及身体自我意识是必需的。

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