The yin and yang of memory consolidation: Hippocampal and neocortical

Lisa Genzel, Janine Rossato, Justin Jacobse, Roddy M. Grieves, Patrick A. Spooner, Francesco P. Battaglia, Guillen Fernandez, Richard G. M. Morris

Research output: Contribution to journalArticlepeer-review

Abstract

While hippocampal and cortical mechanisms of memory consolidation have long been studied, their interaction is poorly understood. We sought to investigate potential interactions with respect to trace dominance, strengthening, and interference associated with postencoding novelty or sleep. A learning procedure was scheduled in a watermaze that placed the impact of novelty and sleep in opposition. Distinct behavioural manipulations—context preexposure or interference during memory retrieval—differentially affected trace dominance and trace survival, respectively. Analysis of immediate early gene expression revealed parallel up-regulation in the hippocampus and cortex, sustained in the hippocampus in association with novelty but in the cortex in association with sleep. These findings shed light on dynamically interacting mechanisms mediating the stabilization of hippocampal and neocortical memory traces. Hippocampal memory traces followed by novelty were more dominant by default but liable to interference, whereas sleep engaged a lasting stabilization of cortical traces and consequent trace dominance after preexposure.
Original languageEnglish
Article numbere2000531
Number of pages26
JournalPLoS Biology
Volume15
Issue number1
DOIs
Publication statusPublished - 13 Jan 2017

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