Event-related desynchronization (ERD) and the Dm effect: Does alpha desynchronization during encoding predict later recall performance?
Event-related desynchronization (ERD) and the Dm effect: Does alpha desynchronization during encoding predict later recall performance?
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DOI：
10.1016/s0167-8760(96)00054-2
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发表时间：
1996-11-01
影响因子：
3
通讯作者：
Pfurtscheller, G
中科院分区：
文献类型：
--
作者：
Klimesch, W;Schimke, H;Pfurtscheller, G
在前人研究的基础上，本研究检验了事件相关去同步化(ERD)在两个阿尔法频段中的变化是否能够预测以后的回忆成绩。在附带记忆范式中，受试者首先必须判断一组96个单词的类别成员。后来，在没有事先警告的情况下，受试者被要求回忆这些单词。结果表明，对于成绩较好的被试，在对单词进行语义编码的过程中，在低α频段的ERD幅度显著大于未记单词，而对于成绩不佳的被试，其上α频段的ERD显著高于未记单词。这种类型的DM效应在两个半球的顶叶记录部位尤其强烈。在提到对上、下阿尔法频段的解释时，目前的发现似乎表明，与表现良好的人相比，表现不佳的人在编码过程中不那么专心或警觉。事件相关电位(ERPs)在顶叶记录部位也产生显著的DM效应。
Based on previous research which has shown that event-related desynchronization (ERD) in the lower and upper alpha band reflects attentional and semantic processing respectively, the present study examines the hypothesis whether event-related shifts in the two alpha bands are capable of predicting later recall performance. In an incidental memory paradigm, subjects first had to judge the category membership for a set of 96 words. Later, without prior warning, subjects were asked to recall the words. The results show that for good performers, the extent of ERD in the lower alpha band during the semantic encoding for words is significantly larger for remembered as compared to not remembered words, whereas for bad performers the ERD in the upper alpha band is significantly more pronounced. This type of Dm effect is particularly strong over parietal recording sites in both hemispheres. In referring to the proposed interpretation of the lower and upper alpha band, the present findings seem to indicate that in contrast to good performers, bad performers are less attentive or alert during encoding. Event-related potentials (ERPs) also yielded significant Dm effects at parietal recording sites.