Memory engrams: Recalling the past and imagining the future

SA Josselyn, S Tonegawa - Science, 2020 - science.org
BACKGROUND The idea that memory is stored as enduring changes in the brain dates
back at least to the time of Plato and Aristotle (circa 350 BCE), but its scientific articulation …

Dentate gyrus circuits for encoding, retrieval and discrimination of episodic memories

T Hainmueller, M Bartos - Nature Reviews Neuroscience, 2020 - nature.com
The dentate gyrus (DG) has a key role in hippocampal memory formation. Intriguingly, DG
lesions impair many, but not all, hippocampus-dependent mnemonic functions, indicating …

The role of inhibitory circuits in hippocampal memory processing

L Topolnik, S Tamboli - Nature Reviews Neuroscience, 2022 - nature.com
GABAergic inhibitory circuits play an essential role in coordinating various hippocampal
functions. Several decades of work dedicated to a thorough characterization of hippocampal …

Engrams and circuits crucial for systems consolidation of a memory

T Kitamura, SK Ogawa, DS Roy, T Okuyama… - Science, 2017 - science.org
Episodic memories initially require rapid synaptic plasticity within the hippocampus for their
formation and are gradually consolidated in neocortical networks for permanent storage …

Adult hippocampal neurogenesis and cognitive flexibility—linking memory and mood

C Anacker, R Hen - Nature Reviews Neuroscience, 2017 - nature.com
Adult hippocampal neurogenesis has been implicated in cognitive processes, such as
pattern separation, and in the behavioural effects of stress and antidepressants. Young adult …

A contextual binding theory of episodic memory: systems consolidation reconsidered

AP Yonelinas, C Ranganath, AD Ekstrom… - Nature Reviews …, 2019 - nature.com
Episodic memory reflects the ability to recollect the temporal and spatial context of past
experiences. Episodic memories depend on the hippocampus but have been proposed to …

The role of engram cells in the systems consolidation of memory

S Tonegawa, MD Morrissey, T Kitamura - Nature Reviews …, 2018 - nature.com
What happens to memories as days, weeks and years go by has long been a fundamental
question in neuroscience and psychology. For decades, researchers have attempted to …

A shared neural ensemble links distinct contextual memories encoded close in time

DJ Cai, D Aharoni, T Shuman, J Shobe, J Biane… - Nature, 2016 - nature.com
Recent studies suggest that a shared neural ensemble may link distinct memories encoded
close in time,,,,,,,,,,,. According to the memory allocation hypothesis,, learning triggers a …

A shift in the mechanisms controlling hippocampal engram formation during brain maturation

AI Ramsaran, Y Wang, A Golbabaei, S Aleshin… - Science, 2023 - science.org
The ability to form precise, episodic memories develops with age, with young children only
able to form gist-like memories that lack precision. The cellular and molecular events in the …

Finding the engram

SA Josselyn, S Köhler, PW Frankland - Nature Reviews Neuroscience, 2015 - nature.com
Many attempts have been made to localize the physical trace of a memory, or engram, in the
brain. However, until recently, engrams have remained largely elusive. In this Review, we …