The effects of memory load and stimulus relevance on the EEG during a visual selective memory search task: An ERP and ERD/ERS study
The effects of memory load and stimulus relevance on the EEG during a visual selective memory search task: An ERP and ERD/ERS study
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DOI：
10.1016/j.clinph.2005.12.008
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发表时间：
2006-04-01
影响因子：
4.7
通讯作者：
Minderaa, RB
中科院分区：
文献类型：
--
作者：
Gomarus, HK;Althaus, M;Minderaa, RB
目的：采用视觉呈现的选择性记忆搜索任务，对18名健康儿童的选择性注意和工作记忆的心理生理学相关进行了研究。方法：被试被要求记忆1个（load 1）或3个（load 3）字母（记忆集），并在4个字母的识别集中搜索这些字母，前提是字母出现在正确的颜色中。结果：在对记忆集合的事件相关电位（ERP）中，发现了一个延长的负荷相关的正性反应，在对再认集合的反应中，相关效应表现为早期的正面正性反应和后期的正面负性反应。负荷的影响被发现在搜索相关的负性内出席类别和抑制的P3振幅。Theta ERS是最明显的最困难的任务条件下，在再认集，而α ERD表现出负荷效应，只有在memorization.Conclusions：刺激相关性和记忆负荷的操纵影响ERP组件和ERD/ERS。本研究范式为研究选择性注意和工作记忆的加工过程提供了一种有用的方法，并可用于考察健康人和非健康人之间的群体差异。对照组和表现出精神病理学的儿童。(c)2006年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: Psychophysiological correlates of selective attention and working memory were investigated in a group of 18 healthy children using a visually presented selective mernory search task.Methods: Subjects had to memorize one (load 1) or 3 (load3) letters (memory set) and search for these among a recognition set consisting of 4 letters only, if the letters appeared in the correct (relevant) color. Event-related potentials (ERPs) as well as alpha and theta event-related synchronization and desynchronization (ERD/ERS) were derived from the EEG that was recorded during the task.Results: In the ERP to the memory set, a prolonged load-related positivity was found. In response to the recognition set, effects of relevance were manifested in an early frontal positivity and a later frontal negativity. Effects of load were found in a search-related negativity within the attended category and a suppression of the P3-amplitude. Theta ERS was most pronounced for the most difficult task condition during the recognition set, whereas alpha ERD showed a load-effect only during memorization.Conclusions: The manipulation of stimulus relevance and memory load affected both ERP components and ERD/ERS.Significance: The present paradigm may supply a useful method for studying processes of selective attention and working memory and can be used to examine group differences between healthy controls and children showing psychopathology. (c) 2006 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.