N400 and LPP in spontaneous trait inferences
N400 and LPP in spontaneous trait inferences
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DOI：
10.1016/j.brainres.2011.08.067
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发表时间：
2011-10-18
期刊：
影响因子：
2.9
通讯作者：
Van Overwalle, Frank
中科院分区：
文献类型：
--
作者：
Baetens, Kris;Van der Cruyssen, Laurens;Van Overwalle, Frank
过去的研究使用事件相关电位（ERP）的自发特质推理一直报告增加晚正电位（LPP）的振幅后，社会预期的违规行为，但没有N400调制。在本研究中，参与者阅读描述未知演员行为的场景。他们需要描述几个暗示行为的积极特质，然后用一个最后的句子描述与之前暗示的特质一致或不一致的行为。在以前的研究中，我们发现显着增加LPP振幅不一致的行为后，在多个额叶网站。与以前的研究不同，我们还发现在几个中心顶叶部位N400振幅增加。这些结果的分歧解释刺激演示程序和ERP组件的极性相反的可能重叠的微小差异。时间主成分分析（PCA）证实了单独的影响，同时LPP和N400 ERP调制，最大的因素的来源是使用sLORETA。这表明，增加的N400在应对特质不一致反映了难以理解的意外行为，而LPP效应可能反映了评价不一致。(C)2011 Elsevier B.V.保留所有权利。
Past research on spontaneous trait inferences using event related potentials (ERPs) has consistently reported increased late positive potential (LPP) amplitudes following social expectancy violations, but no N400 modulation. In the present study, participants read scenarios describing behaviors of unknown actors. They entailed descriptions of several positive trait implying behaviors, followed by a single final sentence describing behavior that was either consistent or inconsistent with the previously implied trait. As in previous studies, we found significantly increased LPP amplitudes following inconsistent behaviors at multiple frontal sites. Unlike in previous research, we also found increased N400 amplitudes at several centro-parietal sites. The divergence of these results is explained from minor differences in the stimulus presentation procedure and possible overlap of ERP components of opposite polarity. Temporal principal component analysis (PCA) confirmed the separate influence of concurrent LPP and N400 ERP modulations, and the source of the largest factors was located using sLORETA. It is suggested that the increased N400 in response to trait inconsistencies reflects difficulties in understanding unanticipated behavior, while the LPP effect might reflect evaluative incongruence. (C) 2011 Elsevier B.V. All rights reserved.