能见度降低对幻觉身体所有权的神经认知影响。

IF 4.7 2区 医学 Q1 NEUROIMAGING NeuroImage Pub Date : 2024-09-28 DOI:10.1016/j.neuroimage.2024.120870
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引用次数: 0

摘要

基于视觉触觉刺激,橡皮手幻觉会诱发对假手的拥有感。在刺激过程中操纵假手的可见度会影响幻觉的认知方面,这表明相关的大脑活动也可能受到影响。为了验证这一点,我们分析了 45 名神经畸形参与者的大脑活动(fMRI)、主观评价和皮肤传导,他们接受了改良的橡胶手幻觉方案,我们在该方案中操纵的是虚拟手的可见度(高、中、低),而不是刷子(虚拟手幻觉;VHI)。为了进一步研究可见度操作对 VHI 相关次生效应(即代入躯体感觉)的影响,我们在 VHI 程序之后进行的代入疼痛程序(观察虚拟手的疼痛刺激)中记录了大脑活动和皮肤电导。结果表明,在 VHI 和替代疼痛期间,不同的视觉、躯体感觉和运动脑区的活动受到以下因素的调节:(i) 可见性操作;(ii) 视觉和触觉刺激之间的连贯性;(iii) 视觉-触觉刺激的时间。相应地,与体现相关的对所感知幻觉的主观评价也受到能见度操作的具体影响。这些研究结果表明,能见度的改变会影响幻觉身体所有权的神经和认知效果,因为当能见度降低时,幻觉会被感知为较弱,视觉、运动和躯体感觉区域的大脑活动会整体降低。我们将这一证据解释为视觉在体现过程中的重要性,因为在幻觉诱发过程中,视觉输入的下降会削弱幻觉身体所有权在大脑皮层和主观方面的影响。
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Neuro-cognitive effects of degraded visibility on illusory body ownership
Based on visuo-tactile stimulation, the rubber hand illusion induces a sense of ownership for a dummy hand. Manipulating the visibility of the dummy hand during the stimulation influences cognitive aspects of the illusion, suggesting that the related brain activity may be influenced too. To test this, we analyzed brain activity (fMRI), subjective ratings, and skin conductance from 45 neurotypical participants undergoing a modified rubber hand illusion protocol where we manipulated the visibility (high, medium, and low) of a virtual hand, not the brush (virtual hand illusion; VHI). To further investigate the impact of visibility manipulations on VHI-related secondary effects (i.e. vicarious somatosensation), we recorded brain activity and skin conductance during a vicarious pain protocol (observation of painful stimulations of the virtual hand) that occurred after the VHI procedure. Results showed that, during both the VHI and vicarious pain periods, the activity of distinct visual, somatosensory, and motor brain regions was modulated by (i) visibility manipulations, (ii) coherence between visual and tactile stimulation, and (iii) time of visuo-tactile stimulation. Accordingly, embodiment-related subjective ratings of the perceived illusion were specifically influenced by visibility manipulations. These findings suggest that visibility modifications can impact the neural and cognitive effects of illusory body ownership, in that when visibility decreases the illusion is perceived as weaker and the brain activity in visual, motor, and somatosensory regions is overall lower. We interpret this evidence as a sign of the weight of vision on embodiment processes, in that the cortical and subjective aspects of illusory body ownership are weakened by a degradation of visual input during the induction of the illusion.
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来源期刊
NeuroImage
NeuroImage 医学-核医学
CiteScore
11.30
自引率
10.50%
发文量
809
审稿时长
63 days
期刊介绍: NeuroImage, a Journal of Brain Function provides a vehicle for communicating important advances in acquiring, analyzing, and modelling neuroimaging data and in applying these techniques to the study of structure-function and brain-behavior relationships. Though the emphasis is on the macroscopic level of human brain organization, meso-and microscopic neuroimaging across all species will be considered if informative for understanding the aforementioned relationships.
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