Theta-gamma coupling during episodic retrieval in the human EEG
Theta-gamma coupling during episodic retrieval in the human EEG
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DOI：
10.1016/j.brainres.2014.06.028
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发表时间：
2014-08-19
期刊：
影响因子：
2.9
通讯作者：
Gruber, Thomas
中科院分区：
文献类型：
--
作者：
Koester, Moritz;Friese, Uwe;Gruber, Thomas
最近的研究结果表明，θ 波段（3-6 Hz）和伽马波段（30-100 Hz）神经元振荡之间的相位幅度耦合在记忆过程中发挥着功能性作用。在这里，我们利用脑电图，为人脑成功记忆检索过程中前额叶θ和顶叶伽马之间的耦合提供了进一步的证据。在图片识别任务中，前额叶 theta 相位和顶叶 gamma 振幅之间的耦合使用调制指数（刺激开始后 100-1500 毫秒）进行量化。结果显示，与遗忘刺激和新刺激相比，记忆刺激的耦合增强（即“识别效应”和“旧/新效应”）。假设前额叶θ相位和后伽马振幅之间的相位振幅耦合反映了前额叶控制过程和伴随助记处理的后部对象表征的激活之间的长距离通信。 (C) 2014 Elsevier B.V. 保留所有权利。
Recent findings indicate that phase-amplitude coupling between neuronal oscillations in the theta- (3-6 Hz) and the gamma-band (30-100 Hz) plays a functional role in memory processes. Here, using electroencephalography, we provide further evidence for coupling between prefrontal theta and parietal gamma during successful memory retrieval in the human brain. In a pictorial recognition task, the coupling between prefrontal theta phase and parietal gamma amplitude was quantified using the modulation index, 100-1500 ms after stimulus onset. Results show an increased coupling for remembered, as opposed to forgotten and new stimuli (i.e. a "recognition effect" and an "old/new effect"). Phase-amplitude coupling between the prefrontal theta phase and posterior gamma amplitudes is hypothesized to reflect long range communication between prefrontal control processes and the activation of posterior object representations accompanying mnemonic processing. (C) 2014 Elsevier B.V. All rights reserved.