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 …

[HTML][HTML] Targeted activation of hippocampal place cells drives memory-guided spatial behavior

NTM Robinson, LAL Descamps, LE Russell… - Cell, 2020 - cell.com
The hippocampus is crucial for spatial navigation and episodic memory formation.
Hippocampal place cells exhibit spatially selective activity within an environment and have …

Fos ensembles encode and shape stable spatial maps in the hippocampus

NL Pettit, EL Yap, ME Greenberg, CD Harvey - Nature, 2022 - nature.com
In the hippocampus, spatial maps are formed by place cells while contextual memories are
thought to be encoded as engrams,,,,–. Engrams are typically identified by expression of the …

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 …

Stepwise synaptic plasticity events drive the early phase of memory consolidation

A Goto, A Bota, K Miya, J Wang, S Tsukamoto, X Jiang… - Science, 2021 - science.org
Memories are initially encoded in the hippocampus but subsequently consolidated to the
cortex. Although synaptic plasticity is key to these processes, its precise spatiotemporal …

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 …

Bidirectional perisomatic inhibitory plasticity of a Fos neuronal network

EL Yap, NL Pettit, CP Davis, MA Nagy, DA Harmin… - Nature, 2021 - nature.com
Behavioural experiences activate the FOS transcription factor in sparse populations of
neurons that are critical for encoding and recalling specific events,–. However, there is …

The brain in motion: How ensemble fluidity drives memory-updating and flexibility

W Mau, ME Hasselmo, DJ Cai - Elife, 2020 - elifesciences.org
While memories are often thought of as flashbacks to a previous experience, they do not
simply conserve veridical representations of the past but must continually integrate new …

[HTML][HTML] An integrated index: engrams, place cells, and hippocampal memory

TD Goode, KZ Tanaka, A Sahay, TJ McHugh - Neuron, 2020 - cell.com
The hippocampus and its extended network contribute to encoding and recall of episodic
experiences. Drawing from recent anatomical, physiological, and behavioral studies, we …