视觉P2成分与θ波锁相有关。

Visual P2 component is related to theta phase-locking.

作者信息

Freunberger R, Klimesch W, Doppelmayr M, Höller Y

机构信息

Department of Physiological Psychology, University of Salzburg, Institute of Psychology, Hellbrunnerstr. 34, A-5020 Salzburg, Austria.

出版信息

Neurosci Lett. 2007 Oct 22;426(3):181-6. doi: 10.1016/j.neulet.2007.08.062. Epub 2007 Sep 5.

DOI:10.1016/j.neulet.2007.08.062

PMID:17904744

Abstract

In this study we investigated the hypothesis whether P2-related differences tested in a visual priming paradigm are associated with theta phase-locking. We recorded the EEG from 31 electrodes and calculated phase-locking index and total power differences for frequencies between 2 and 20 Hz. ERPs (event-related potentials) were analyzed for P1, N1 and P2 components. P2 showed strongest task-related amplitude differences between congruent and incongruent targets. A source analyses was performed for the P2 component using sLoreta that revealed local generators of the P2 in parieto-occipital regions. Phase-locking analyses showed specific effects in the theta range (4-6 Hz) appearing in time windows at around the P2 component. We draw the conclusion that phase-locked theta reflect top-down regulation processes mediating information between memory systems and is in part involved in the modulation of the P2 component.

摘要

在本研究中，我们探讨了一个假设，即在视觉启动范式中测试的与P2相关的差异是否与θ相位锁定有关。我们从31个电极记录脑电图，并计算2至20赫兹频率之间的相位锁定指数和总功率差异。对事件相关电位（ERP）的P1、N1和P2成分进行了分析。P2在一致和不一致目标之间显示出最强的任务相关振幅差异。使用sLoreta对P2成分进行了源分析，结果显示P2在顶枕区域有局部发生器。相位锁定分析显示，在P2成分出现的时间窗口内，θ范围（4-6赫兹）有特定效应。我们得出结论，锁相θ反映了记忆系统之间介导信息的自上而下调节过程，并且部分参与了P2成分的调制。