Transient slow gamma synchrony underlies hippocampal memory replay.

Transient slow gamma synchrony underlies hippocampal memory replay.
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DOI:
10.1016/j.neuron.2012.06.014
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发表时间:
2012-08-23
期刊:
影响因子:
16.2
通讯作者:
Frank LM
Frank LM
中科院分区:
医学1区
文献类型:
--
作者:
Carr MF;Karlsson MP;Frank LM

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The replay of previously stored memories during hippocampal sharp wave ripples (SWRs) is thought to support both memory retrieval and consolidation in distributed hippocampal-neocortical circuits. Replay events consist of precisely timed sequences of spikes from CA3 and CA1 neurons that are coordinated both within and across hemispheres. The mechanism of this coordination is not understood. Here we show that during SWRs in both awake and quiescent states there are transient increases in slow gamma (20-50Hz) power and synchrony across dorsal CA3 and CA1 networks of both hemispheres. These gamma oscillations entrain CA3 and CA1 spiking. Moreover, during awake SWRs, higher levels of slow gamma synchrony are predictive of higher quality replay of past experiences. Our results indicate that CA3–CA1 gamma synchronization is a central component of awake memory replay and suggest that transient gamma synchronization serves as a clocking mechanism to enable coordinated memory reactivation across the hippocampal network.
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