The role of expectation in multisensory body representation - neural evidence
The role of expectation in multisensory body representation - neural evidence
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DOI：
10.1111/ejn.13629
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发表时间：
2017-08-01
影响因子：
3.4
通讯作者：
Costantini, Marcello
中科院分区：
文献类型：
--
作者：
Ferri, Francesca;Ambrosini, Ettore;Costantini, Marcello
感官事件有助于身体所有权，即身体属于我的感觉。然而，感觉事件的编码不仅是反应性的，而且是主动的，因为我们的大脑会对即将到来的刺激产生预测。在以往的研究中，我们已经证明，对感官事件的预测是诱发身体所有权感的充分条件。在这项研究中，我们探讨了潜在的神经机制。参与者的右臂搁在另一张小桌子下面的桌子上。因此，真实的手被隐藏在参与者的视线之外，一个真人大小的右手橡胶模型被放在他们面前的小桌子上。参与者在接近——但不接触——橡胶手时观察一块木板。我们通过问卷调查的方式来测量幻觉的现象学。神经活动用近红外光谱（fNIRS）记录。结果表明，触觉期望引起的橡胶手错觉中，多感觉顶叶皮层的激活程度较高。此外，这种活动与拥有橡胶手的主观感觉相关。我们的研究结果丰富了目前的身体所有权模型，表明我们的多感官大脑区域可以预测什么是我的身体，什么不是。这一发现可能会对所有身体表征发生改变的病例，如厌食症、神经性贪食症和肥胖症等，产生有趣的影响。
Sensory events contribute to body ownership, the feeling that the body belongs to me. However, the encoding of sensory events is not only reactive, but also proactive in that our brain generates prediction about forthcoming stimuli. In previous studies, we have shown that prediction of sensory events is a sufficient condition to induce the sense of body ownership. In this study, we investigated the underlying neural mechanisms. Participants were seated with their right arm resting upon a table just below another smaller table. Hence, the real hand was hidden from the participant's view and a life-sized rubber model of a right hand was placed on the small table in front of them. Participants observed a wooden plank while approaching - without touching - the rubber hand. We measured the phenomenology of the illusion by means of questionnaire. Neural activity was recorded by means of near-infrared spectroscopy (fNIRS). Results showed higher activation of multisensory parietal cortices in the rubber hand illusion induced by touch expectation. Furthermore, such activity was correlated with the subjective feeling of owning the rubber hand. Our results enrich current models of body ownership suggesting that our multisensory brain regions generate prediction on what could be my body and what could not. This finding might have interesting implications in all those cases in which body representation is altered, anorexia, bulimia nervosa and obesity, among others.