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首页> 外文期刊>The European Journal of Neuroscience >Rhinal-hippocampal theta coherence during declarative memory formation: interaction with gamma synchronization?
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Rhinal-hippocampal theta coherence during declarative memory formation: interaction with gamma synchronization?

机译：声明性记忆形成过程中的鼻-海马θ相干性：与伽马同步的相互作用？

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摘要

The hippocampus and the rhinal cortex, two substructures of the medial temporal lobe, together play a crucial role in human declarative memory formation. To investigate in detail the mechanism connecting these two structures transiently during memory formation we recorded depth EEG in epilepsy patients from within the hippocampus and the rhinal cortex. During this recording, patients performed a single-trial word list-learning paradigm with a free recall memory test following a distraction task. Rhinal-hippocampal EEG coherence and spectral power at both locations in the time interval up to 2 s after onset of word presentation were analysed in the frequency range 1-19 Hz. Successful as opposed to unsuccessful memory formation was associated with a general rhinal-hippocampal coherence enhancement, but without alterations in spectral power. Coherence increases in the theta range were correlated with the previously reported memory-related changes in rhinal-hippocampal gamma phase synchronization. This correlation may suggest an interaction of the two mechanisms during declarative memory formation. While theta coherence might be associated with slowly modulated coupling related to an encoding state, rhinal-hippocampal gamma synchronization may be more closely related to actual memory processes by enabling fast coupling and decoupling of the two structures.
机译：海马和鼻皮质是颞叶内侧的两个子结构，在人类陈述性记忆形成中起着至关重要的作用。为了详细研究在记忆形成过程中瞬时连接这两个结构的机制，我们记录了海马和鼻皮质内癫痫患者的深度脑电图。在此录音过程中，患者在分心任务后执行了一次免费单词记忆学习测试的单次试音列表学习范例。在出现单词出现后最多2 s的时间间隔内，在1-19 Hz的频率范围内分析两个位置的鼻-海马脑电图相干性和频谱功率。与不成功的记忆形成相反，成功与一般的鼻-海马相干性增强有关，但频谱功率没有改变。 θ范围内的相干性增加与先前报道的鼻-海马γ相同步的记忆相关变化有关。这种相关性可能暗示了声明式记忆形成过程中两种机制的相互作用。尽管θ相干性可能与与编码状态有关的缓慢调制的耦合相关联，但通过实现两个结构的快速耦合和去耦，鼻-海马伽马同步可能与实际的存储过程更加紧密相关。

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