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Related Concept Videos

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Related Experiment Video

Updated: Dec 5, 2025

Longitudinal Two-Photon Imaging of Dorsal Hippocampal CA1 in Live Mice
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Time as the fourth dimension in the hippocampus.

Jean-Paul Banquet1, Philippe Gaussier1, Nicolas Cuperlier1

  • 1ETIS UMR 8051, CY Cergy-Paris Université, ENSEA, CNRS, 2 Avenue Adolphe Chauvin, B.P. 222, F-95000, Cergy-Pontoise, France.

Progress in Neurobiology
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Summary

The hippocampus is crucial for processing time and sequences, not just space. This review details how hippocampal

Keywords:
HippocampusPhase precessionPreplay/ReplayProspective/Retrospective codingTime cellsTransitions

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Computational Neuroscience

Background:

  • The perception and experience of time are fundamental to cognition.
  • The hippocampal system is known for spatial processing and navigation.
  • Its role in temporal processing, including memory and sequence learning, is increasingly recognized.

Purpose of the Study:

  • To review key findings on hippocampal temporal processing in rodents and humans.
  • To explore neural mechanisms underlying timing, sequence processing, and memory.
  • To discuss computational models of hippocampal sequencing and temporal cognition.

Main Methods:

  • Review of experimental findings in rats and human studies.
  • Analysis of neural activity, including 'time cells' and ramping activity.
  • Examination of 'online' sequence processing and 'off-line' replay during rest/sleep.
  • Discussion of neural mechanisms (ion channels, oscillations, synaptic plasticity).
  • Inclusion of computational neural network models.

Main Results:

  • Hippocampal 'time cells' and lateral entorhinal cortex ramping cells track time.
  • 'Online' and 'off-line' sequence processing by neuronal assemblies are identified.
  • Human studies show parallels between episodic memory and sequence replay.
  • Neural mechanisms involve cellular properties, network dynamics, and synaptic plasticity.
  • Models suggest processes for scalar timing (Weber's Law) and event sequencing.

Conclusions:

  • The hippocampal system plays a vital, multifaceted role in temporal processing and memory.
  • Both 'online' and 'off-line' neural activity support sequence learning and memory.
  • Neural mechanisms involve complex interactions at cellular and network levels.
  • Computational models offer insights into the emergence of temporal cognition.