Somatosensory Working Memory Performance in Humans Depends on Both Engagement and Disengagement of Regions in a Distributed Network

被引:188
作者
Haegens, Saskia [1 ]
Osipova, Daria [1 ]
Oostenveld, Robert [1 ]
Jensen, Ole [1 ]
机构
[1] Radboud Univ Nijmegen, Donders Inst Brain Cognit & Behav, Ctr Cognit Neuroimaging, NL-6500 HB Nijmegen, Netherlands
关键词
alpha; gamma; magnetoencephalography (MEG); oscillations; synchronization; executive control; GAMMA-BAND ACTIVITY; ALPHA OSCILLATIONS; HUMAN BRAIN; SPATIAL ATTENTION; DECISION-MAKING; PARIETAL CORTEX; MEG-DATA; TASK; MAGNETOENCEPHALOGRAPHY; LOCALIZATION;
D O I
10.1002/hbm.20842
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Successful working memory (WM) requires the engagement of relevant brain areas but possibly also the disengagement of irrelevant areas. We used magnetoencephalography (MEG) to elucidate the temporal dynamics of areas involved in a somatosensory WM task. We found an increase in gamma band activity in the primary and secondary somatosensory areas during encoding and retention, respectively. This was accompanied by an increase of alpha band activity over task-irrelevant regions including posterior and ipsilateral somatosensory cortex. Importantly, the alpha band increase was strongest during successful WM performance. Furthermore, we found frontal gamma band activity that correlated both with behavioral performance and the alpha band increase. We suggest that somatosensory gamma band activity reflects maintenance and attention-related components of WM operations, whereas alpha band activity reflects frontally controlled disengagement of task-irrelevant regions. Our results demonstrate that resource allocation involving the engagement of task-relevant and disengagement of task-irrelevant regions is needed for optimal task execution. Hum Brain Mapp 31:26-35,2010. (C) 2009 Wiley-Liss, Inc.
引用
收藏
页码:26 / 35
页数:10
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