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首页> 外文期刊>Clinical neurophysiology >Event-related potential N270, a negative component to identification of conflicting information following memory retrieval.
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Event-related potential N270, a negative component to identification of conflicting information following memory retrieval.

机译：事件相关电位N270，它是内存检索后识别冲突信息的否定成分。

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OBJECTIVE: N270, an endogenous ERP component of conflict effect, was evoked in previous studies with S1-S2 paradigm. The present experiment is designed to confirm the speculation that this conflict-related negativity could also be elicited by stimulus probes having conflict with a memorized item in a visual post-retrieval comparison task.METHODS: A Sternberg probe-matching paradigm was modified in the present study. The stimuli consisted of a memory set of 3 different items (simple figures) and a retrieval set of 3 probe figures. Subjects matched each probe to its corresponding item in the memory set. The tasks were designed with different conflict loads of no-conflict, low-conflict and high-conflict in the probe retrieval test.RESULTS: Probes of no-conflict elicited a major positive going component, P300, with bilateral parietal distribution. Probes of low- and high-conflict evoked N270, while N430 was elicited only in high-conflict condition. N270 was more negative in high-conflict condition than in low-conflict condition. The N270 was right hemispheric prominent in the low-conflict task and remarkably distributed over the right prefrontal areas. On the other hand, both N270 and N430 were distributed bilaterally on the scalp in the high-conflict task.CONCLUSIONS: The present results demonstrate that the N270 is an index to the conflict identification, while the N430 of the high-conflict task reflects the processing for complex conflicts following probe retrieval. These negativities are related to the processing of conflicts.
机译：目的：N270是冲突效应的内源性ERP成分，在先前的关于S1-S2范式的研究中被提到。本实验旨在证实这样的推测，即与视觉上的检索后比较任务中与记忆的项目有冲突的刺激探针也可能引发这种与冲突有关的消极现象。方法：在本研究中，对Sternberg探针匹配范例进行了修改研究。刺激包括3个不同项目（简单图形）的存储集和3个探测图形的检索集。受试者将每个探针与其在存储集中的对应项目匹配。在探查检索测试中，任务被设计为具有无冲突，低冲突和高冲突的不同冲突负荷。结果：无冲突的探针引起了主要的积极参与，P300，具有双边顶板分布。低冲突和高冲突的探针引发了N270，而N430仅在高冲突条件下被引发。 N270在高冲突条件下比在低冲突条件下更阴性。 N270在低冲突任务中处于右半球位置，并且明显分布在右前额叶区域。另一方面，在高冲突任务中，N270和N430均在头皮上双向分布。结论：目前的结果表明，N270是冲突识别的指标，而高冲突任务的N430则反映了冲突特征。探针检索后处理复杂冲突。这些负面因素与冲突的处理有关。

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