Abstract: Preparation effect could be regarded as what individual did or knowledge obtained during the preparation period having influence on insight problem solving. Whether preparation time has a positive or negative influence or even both on insight problem solving has not reached a uniform conclusion. Time course of insight problem solving has not been validly studied. Thus, this research, based on the catalyze paradigm, compared the event related potentials variations in logogriph understanding between two conditions: with or without preparation. The result showed that between 200ms and 900ms, preparation effect elicited a positive ERP deflection(P200-900), activating most of the scalp regions; preparation effect elicited a positive ERP deflection(P900-1400)in frontal and central scalp regions and a negative ERP deflection(N900-1400)in occipital scalp regions, respectively. It is indicated that: 1)processing in preparation has effect on understanding of the logogriphs. 2)The preparation effect has both facilitation and inhibition on the logogriph understanding. 3)P200-900 may reflect inhibition from the prior knowledge to insight problem solving, P900-1400 as well as N900-1400 indicates inhibition and facilitation from the prior knowledge being together.

摘要： 基于机会同化模型,采用催化范式,运用事件相关电位（ERP）技术,比较有准备阶段和无准备阶段汉字字谜理解过程中准备效应的脑内变化。结果发现,在200ms-900ms内,准备效应引起了一个正的ERP成分（P200-900）,大部分脑区得到激活;在900ms-1400ms内,准备效应主要在额区、中央区引起了一个P900-1400成分,在枕区引起了一个N900-1400成分。结果表明,准备期的加工影响了对字谜的理解,准备效应对字谜理解的作用是促进与抑制作用并存。

关键词: 准备效应, 理解, 字谜, ERP