Intelligence and working memory systems: evidence of neural efficiency in alpha band ERD
Intelligence and working memory systems: evidence of neural efficiency in alpha band ERD
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DOI：
10.1016/j.cogbrainres.2004.02.010
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发表时间：
2004-07-01
期刊：
影响因子：
--
通讯作者：
Neubauer, AC
中科院分区：
文献类型：
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作者：
Grabner, RH;Fink, A;Neubauer, AC
从公认的发现开始，聪明的人在执行认知任务时表现出更有效的大脑功能（即，神经效率），我们研究了工作记忆（WM）任务背景下智力和皮层激活之间的关系。55名男性（n=28）和女性（n=27）被试分别完成（1）只要求短时记忆（STM）的经典前向数字广度任务、（2）利用工作记忆中央执行（CE）的注意转换任务和（3）涉及STM存储和CE加工的工作记忆任务。在执行这三种类型的任务期间，通过人类EEG的α带中的事件相关去极化（ERD）的程度来量化皮质激活。相关性分析揭示了上阿尔法带中ERD的数量与多个大脑区域的智力之间的关联。在所有的任务中，男性更容易表现出负性智力-皮层激活关系。此外，ERD和智力之间更强的关联被发现为流体而不是结晶智力。分析还指出，地形上的差异，神经效率取决于性别，任务类型和相关的认知子系统在任务执行过程中从事。(C)2004 Elsevier B. V.保留所有权利。
Starting from the well-established finding that brighter individuals display a more efficient brain function when performing cognitive tasks (i.e., neural efficiency), we investigated the relationship between intelligence and cortical activation in the context of working memory (WM) tasks. Fifty-five male (n=28) and female (n=27) participants worked on (1) a classical forward digit span task demanding only short-term memory (STM), (2) an attention-switching task drawing on the central executive (CE) of WM and (3) a WM task involving both STM storage and CE processes. During performance of these three types of tasks, cortical activation was quantified by the extent of Event-Related Desynchronization (ERD) in the alpha band of the human EEG. Correlational analyses revealed associations between the amount of ERD in the upper alpha band and intelligence in several brain regions. In all tasks, the males were more likely to display the negative intelligence-cortical activation relationship. Furthermore, stronger associations between ERD and intelligence were found for fluid rather than crystallized intelligence. Analyses also point to topographical differences in neural efficiency depending on sex, task type and the associated cognitive subsystems engaged during task performance. (C) 2004 Elsevier B.V. All rights reserved.