Dorsal and ventral cortices are coupled by cross-frequency interactions during working memory
Dorsal and ventral cortices are coupled by cross-frequency interactions during working memory
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DOI：
10.1016/j.neuroimage.2018.05.054
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发表时间：
2018-09
期刊：
影响因子：
5.7
通讯作者：
Tzvetan Popov;O. Jensen;J. Schoffelen
中科院分区：
文献类型：
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作者：
Tzvetan Popov;O. Jensen;J. Schoffelen
阿尔法和伽马波段的振荡活动被认为是塑造功能性大脑结构的关键。高频伽马频段的功率增加通常与低频阿尔法频段的功率降低并行报告。然而，它们的功能意义，特别是它们的相互作用还没有被很好地理解。本研究表明，在N-back工作记忆任务的背景下，背侧视流的α功率降低与早期视觉区域的伽马功率增加有关。Granger因果关系分析揭示了从背侧流区到腹侧流区的定向区域间交互作用，与任务要求一致。目前的结果揭示了阿尔法和伽马活动之间牢固的、与行为相关的、在体系结构上具有决定性的功率-功率关系。这种关系表明，在工作记忆等认知操作过程中，振荡活动中解剖学上遥远的能量波动可以在逐个试验的基础上将大脑网络动力学联系起来。
Oscillatory activity in the alpha and gamma bands is considered key in shaping functional brain architecture. Power increases in the high-frequency gamma band are typically reported in parallel to decreases in the low-frequency alpha band. However, their functional significance and in particular their interactions are not well understood. The present study shows that, in the context of an N-back working memory task, alpha power decreases in the dorsal visual stream are related to gamma power increases in early visual areas. Granger causality analysis revealed directed interregional interactions from dorsal to ventral stream areas, in accordance with task demands. Present results reveal a robust, behaviorally relevant, and architectonically decisive power-to-power relationship between alpha and gamma activity. This relationship suggests that anatomically distant power fluctuations in oscillatory activity can link cerebral network dynamics on trial-by-trial basis during cognitive operations such as working memory.