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  1. Research >>EEG
  2. EEG基本知识的理论介绍

ERP 成分

PreviousERP 介绍NextEEG 数据分析软件

Last updated 3 years ago

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常用 ERP 成分及用途

  1. 偏侧预备电位LRP(Lateralized readiness potential) 指在随意运动中，反应效应器方位所对应的对侧大脑皮层出现的准备电位。LRP分析的关键是确定启动时间点。LRP可以揭示刺激-反应不同阶段的认知加工时间特性。

  2. 伴随性负变化CNV(contingent negative variation) 主要与心理因素相关 - 学术界提出期待、意动、朝向、反应、觉醒、注意、动机等不同假说，但未能统一。

  3. P300 P300 是在事件(如听觉、视觉刺激)发生后大约300ms出现的一个正向波。头皮记录 Pz 点波幅最高。学者认为：代表知觉任务的结束或潜伏期反映对刺激物的评价或分类所需要的时间。 经典的ERP实验范式： Oddball实验模式、Go-Nogo范式。

  4. 识别电位RP(Recognition potential) 视觉刺激诱发的 200-300ms 的负电位。视觉刺激，不论刺激图像能否被识别，都会在 500ms 内诱发出一系列波幅较高的视觉诱发电位(VEP)晚成分。其中的 RP 在 250ms 左右出现，波幅较小。常需要通过减弱VEP晚成分而分离出RP (Rudell 等,1991,1992 ,1997) 诱发RP的实验范式：前置刺激法(preempt stimulus technique)，快速刺激序列法(rapid stream stimulation)

    影响RP的因素: 刺激的物理因素和心理因素。

    物理因素：刺激物的位置，清晰度，背景等。 心理因素：语义加工，图片与文字的内容。

  5. 加工负波 PN (Processing Negativity) 与信息加工有关的听觉有关。从刺激呈现后 150ms 开始，持续约350ms。 以视觉注意作为听觉非注意对照的实验较为可靠。

RP与P300的区别： P300 只与刺激的概率有关，与是否可被识别无关。 RP 只与是否可被识别有关，与刺激的概率无关。

Reference:

CHEN Li-Han. Meaning and Applications of Lateralized Readiness Potential[J]. , 2008, 16(05): 712-720. 事件相关电位基础(美）STEVENJ.LUCK 著，范思陆、丁玉珑、曲折、傅世敏译范思陆 高定国 校，2009，华东师范大 学出版。 事件相关电位原理与技术/魏景汉，罗跃嘉编著.一北京:科学出版社，2010 ERPs 实验教程/赵仑著.—2 版(修订本).一-南京:东南大学出版社, 2010.7 事件相关电位ERP

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https://www.bilibili.com/read/cv3843526
各种ERP成分与功能