摘要
目的通过汉语双字词在直接再认测验中诱发的事件相关电位(ERPs),探讨汉词再认新旧效应的具体成分及其特点。方法使用经典的“学习-再认”实验模式对21名大学生进行汉词再认测验,记录EEG,对新旧效应ERPs的主要成分进行分析。结果汉词再认过程中旧词与新词的差异主要体现在N320及LPC(latepositivecomponent)成分,旧词的N320及LPC波幅均大于新词,且LPC潜伏期较新词有显著缩短。旧词减新词所得差异负波N300主要分布于额-中央区;而差异正波P500主要分布于顶区。结论汉词再认的新旧效应也包括顶区新旧效应与额区新旧效应两种成分,其中额区新旧效应表现为负走向,可能与研究材料—汉语双字词的认知加工特点有关。
Objective To study the ERP old/new effects during a recognition task for Chinese words. Method Twenty one healthy right-handed volunteers received a Chinese words recognition task. The stimuli were meaningful words consisting of two Chinese characters. The EEG signals were recorded from 9 scalp sites of the extended 10~20 systems. Result Compared with the new words, the old words elicited larger N320 (the frontal old/new effect) at the frontal brain areas and larger LPC (the parietal old/new effect) at the parietal brain areas. And the peak of LPC appeared significantly earlier in old words ERPs than in new words ERPs. Conclusion The old/new effect is significant for the recognition of Chinese words, which also consists of the frontal old/new effect and the parietal old/new effect. The parietal old/new effect is positive-going, but the frontal old/new effect is negative-going. The frontal old/new effect might be affected by the language and material.
出处
《航天医学与医学工程》
CAS
CSCD
北大核心
2005年第2期154-156,共3页
Space Medicine & Medical Engineering
关键词
事件相关电位
汉字
认知
新旧效应
event-related potentials
Chinese characters
recognition
old/new effects
