Event-related potentials of verbal encoding into episodic memory:: Dissociation between the effects of subsequent memory performance and distinctiveness
Event-related potentials of verbal encoding into episodic memory:: Dissociation between the effects of subsequent memory performance and distinctiveness
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DOI：
10.1111/1469-8986.3560709
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发表时间：
1998-11-01
期刊：
影响因子：
3.7
通讯作者：
Heinze, HJ
中科院分区：
文献类型：
--
作者：
Fernández, G;Weyerts, H;Heinze, HJ
采用事件相关电位（ERP）技术，在注意力分散后自由回忆的单次字表学习范式中检测了情节记忆编码和独特性检测。为了操纵独特性，对高频和极低频词的编码进行了对比。低频词的N400和晚期阳性成分（LPC）的幅值大于高频词，随后回忆的词的ERPs比未回忆的词更积极。这种随后的记忆效应从N400的极性和LPC的时程的独特性的相关性中分离出来，并可分离成两种效应。数据表明，第一个随后的记忆效果，这两个词的类别发生，更直接地与情节记忆的形成，而第二个效果，这只发生在高频词，是间接影响情节编码成功的过程。
Episodic memory encoding and distinctiveness detection were examined using event-related potentials (ERP) in a single-trial word list learning paradigm with free recall following distraction. To manipulate distinctiveness, encoding of high- and very low-frequency words was contrasted. Amplitudes of the N400 and late positive component (LPC) were larger for low- than for high-frequency words, and ERPs were more positive for subsequently recalled than not recalled words. This subsequent memory effect was dissociated from the correlates of distinctiveness by polarity for the N400 and by time course for the LPC and dissociable into two effects. The data suggest that the first subsequent memory effect, which occurred for both word categories, is more directly related to episodic memory formation, whereas the second effect, which occurred for high-frequency words only, is related to processes influencing episodic encoding success indirectly.