单侧化准备电位的含义和应用

Meaning and Applications of Lateralized Readiness Potential

单侧化准备电位(Lateralized readiness potential,LRP)是指在随意运动中,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。可以从反应准备的抽象性或具体性以及大脑控制运动输出的"中枢"机制或"外周"机制这两个思路去验证LRP。LRP在阈下知觉和内隐学习、运动准备和反应执行、西蒙效应等方面的认知心理学研究以及新兴的脑-机界面工程心理学研究得到了广泛的应用,但LRP的应用存在着某些限制因素,如:脑电干扰、测量的低信噪比和其本身对反应效应器的要求等。

In involuntary movement, Lateralized readiness potential （LRP） refers to negative lateralized readiness potential which occurs to the cerebral cortex contralateral to the response effector. The crux of LRP analysis is to find the appropriate ＂onset＂ time. LRP can reveal the different cognitive processing temporal features in the stimulusresponse link. Two methods were discussed to validate LRP： the concreteness of the preparedness of response and the movement controlling origins. The broad applications of LRP were illustrated by examples from subliminal perception, movement preparation and Simon Effect in cognitive studies and the on-going study of Brain-Computer Interface （BCI）. However, there are some limitations in the applications of LRP, such as interferences from other EEG components, the low signal-to-noise ratio in measurement and the requirement of single lateral response effector, etc.