Theta resynchronization during reconsolidation of remote contextual fear memory

Narayanan, RT; Seidenbecher, T; Sangha , S; Stork, O; Pape, HC

doi:10.1097/WNR.0b013e3282004992

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Theta resynchronization during reconsolidation of remote contextual fear memory

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https://insights.ovid.com/article/00001756-200707160-00004
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Narayanan, R., Seidenbecher, T., Sangha, S., Stork, O., & Pape, H. (2007). Theta resynchronization during reconsolidation of remote contextual fear memory. NeuroReport, 18(11), 1107-1111. doi:10.1097/WNR.0b013e3282004992.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-CCAF-C

Abstract

We have recently demonstrated high theta-phase synchronization between the lateral amygdala and CA1 area of the hippocampus during retrieval of long-term (1 day) fear memory, and not during short-term (2 h) or remote memory retrieval (30 days). These results indicated that the amygdalo-hippocampal interaction reflects a dynamic change of ensemble activities related to various stages of fear memory storage. In this study, we investigated theta activity during the reconsolidation of a remote contextual fear memory by re-exposing animals to the shock context 30 days after training. Consistent with our previous results, high theta synchronization was no longer apparent during re-exposure to the shock context, but was significantly higher 1 day after context re-exposure. These data indicate that the reconsolidation of remote contextual fear memory includes changes in ensemble activities between the lateral amygdala and CA1.