Being only with yourself enhances the binding of stimulus representations with both egocentric- and allocentric-representations of the self: A P2 event-related potential study

IF 2.6 4区 医学 Q3 NEUROSCIENCES
Sujata Sinha , Ashley Chau-Morris , J. Bruno Debruille
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Abstract

Perceiving a stimulus involves the awareness that it is we who are perceiving it. Representations activated by the stimulus are thus automatically bound to representations of the self. Interestingly, previous research has shown that the amplitude of the P2 event-related brain potential (ERP) is larger for stimuli to which participants can refer themselves. This suggests that the P2 may index the binding of stimulus representations with self-representations and that this binding is modulable, like other automatic processes. P2 amplitudes could then be larger in participants who are only with themselves than in those with a friend (PwFs). Consistently, we found larger P2s in alones (n = 53) than in PwFs (n = 47) at two scalp locations. Firstly, at the midline central electrode, where large self-referencing effects were previously observed, indicating stronger binding with egocentric self-representations. Secondly, at the left temporo-occipital sites, suggesting stronger allocentric self-representation binding. Furthermore, these P2 effects were maximal for words with richer meanings, that is, for equivocal ones, intermediate for unequivocal-, and minimal for meaningless stimuli. P2 amplitude was thus modulated not only by current self-representations but also by stimulus representations, in accordance with the idea that it indexes their binding.

Abstract Image

只和自己在一起会增强刺激表征与自我中心和非中心表征的结合:一项P2事件相关电位研究
感知刺激包括意识到是我们在感知它。因此,被刺激激活的表征自动地与自我表征绑定在一起。有趣的是,先前的研究表明,对于参与者可以参考的刺激,P2事件相关脑电位(ERP)的振幅更大。这表明P2可能索引刺激表征与自我表征的结合,并且这种结合是可调节的,就像其他自动过程一样。只和自己在一起的人的P2振幅可能比和朋友在一起的人更大(pwf)。一致地,我们在两个头皮位置发现单独的P2s (n = 53)比PwFs (n = 47)更大。首先,在中线中心电极,先前观察到大量的自我参照效应,表明与以自我为中心的自我表征的结合更强。其次,在左侧颞枕区,表明更强的非中心自我表征结合。此外,这些P2效应在意义更丰富的单词(即模棱两可的单词)中最大,在明确刺激中居中,在无意义刺激中最小。因此,P2振幅不仅受到当前自我表征的调节,也受到刺激表征的调节,这与它对它们的结合进行索引的想法是一致的。
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来源期刊
Brain Research
Brain Research 医学-神经科学
CiteScore
5.90
自引率
3.40%
发文量
268
审稿时长
47 days
期刊介绍: An international multidisciplinary journal devoted to fundamental research in the brain sciences. Brain Research publishes papers reporting interdisciplinary investigations of nervous system structure and function that are of general interest to the international community of neuroscientists. As is evident from the journals name, its scope is broad, ranging from cellular and molecular studies through systems neuroscience, cognition and disease. Invited reviews are also published; suggestions for and inquiries about potential reviews are welcomed. With the appearance of the final issue of the 2011 subscription, Vol. 67/1-2 (24 June 2011), Brain Research Reviews has ceased publication as a distinct journal separate from Brain Research. Review articles accepted for Brain Research are now published in that journal.
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