Dynamic links between theta executive functions and alpha storage buffers in auditory and visual working memory.
Dynamic links between theta executive functions and alpha storage buffers in auditory and visual working memory.
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DOI：
10.1111/j.1460-9568.2010.07217.x
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发表时间：
2010-05
期刊：
影响因子：
--
通讯作者：
Yamaguchi Y
中科院分区：
文献类型：
--
作者：
Kawasaki M;Kitajo K;Yamaguchi Y
工作记忆（WM）任务不仅需要不同的功能，如存储缓冲区和中央执行功能，但这些功能之间的协调。神经影像学研究揭示了不同的大脑区域在工作记忆任务中的不同功能作用，然而，很少有人知道的神经机制，管理他们的协调。在WM任务中，脑电（EEG）节律，特别是θ和α，会出现在分布的脑区，但与任务相关的区域耦合的节律至今尚未得到。在这项研究中，我们进行了时频分析的EEG数据在WM任务，包括操作期间和记忆存储缓冲期间。我们使用了听觉工作记忆任务和视觉工作记忆任务。结果成功地证明了功能特异性EEG活动。在这两个任务的操作期间，额叶θ振幅增加。α振幅增加，不仅在操作，但也在颞区的听觉工作记忆和顶叶区的视觉工作记忆的维持期。相位同步分析表明，在相关的任务条件下，颞叶和顶叶区域显示增强的相位同步在θ带与额叶区域，而θ和α之间的相位同步显着增强，只有在个别地区。我们的研究结果表明，WM任务相关的大脑区域协调远θ同步中央执行功能，本地α同步的记忆存储缓冲区，和θ-α耦合功能间的整合。
Working memory (WM) tasks require not only distinct functions such as a storage buffer and central executive functions, but also coordination among these functions. Neuroimaging studies have revealed the contributions of different brain regions to different functional roles in WM tasks; however, little is known about the neural mechanism governing their coordination. Electroencephalographic (EEG) rhythms, especially theta and alpha, are known to appear over distributed brain regions during WM tasks, but the rhythms associated with task-relevant regional coupling have not been obtained thus far. In this study, we conducted time–frequency analyses for EEG data in WM tasks that include manipulation periods and memory storage buffer periods. We used both auditory WM tasks and visual WM tasks. The results successfully demonstrated function-specific EEG activities. The frontal theta amplitudes increased during the manipulation periods of both tasks. The alpha amplitudes increased during not only the manipulation but also the maintenance periods in the temporal area for the auditory WM and the parietal area for the visual WM. The phase synchronization analyses indicated that, under the relevant task conditions, the temporal and parietal regions show enhanced phase synchronization in the theta bands with the frontal region, whereas phase synchronization between theta and alpha is significantly enhanced only within the individual areas. Our results suggest that WM task-relevant brain regions are coordinated by distant theta synchronization for central executive functions, by local alpha synchronization for the memory storage buffer, and by theta–alpha coupling for inter-functional integration.
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影响因子：
2.5
作者：
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