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Episodic memory: Neuronal codes for what, where, and when.

Jørgen Sugar1, May-Britt Moser1

  • 1Centre for Neural Computation, Egil and Pauline Braathen and Fred Kavli Center for Cortical Microcircuits, Kavli Institute for Systems Neuroscience, Norwegian University for Science and Technology (NTNU), Trondheim, Norway.

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Summary
This summary is machine-generated.

The entorhinal cortex and hippocampus use a neuronal code to form episodic memories, integrating location, time, and experience content for recall.

Keywords:
allocentriccognitive mapegocentricpattern completionpattern separationplace celltime cell

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Episodic memory relies on recalling events within a spatiotemporal context.
  • The hippocampal formation and entorhinal cortex are crucial for episodic memory formation.

Purpose of the Study:

  • To review how neuronal codes in the entorhinal cortex and hippocampus meet the requirements for episodic memory formation.
  • To explain the roles of different neuronal populations in encoding spatial, temporal, and content information.

Main Methods:

  • Review of existing literature on neuronal coding in the entorhinal cortex and hippocampus.
  • Analysis of how these codes support the requirements for episodic memory.

Main Results:

  • The entorhinal cortex provides instant information on ongoing experiences to the hippocampus.
  • Medial entorhinal cortex grid cells offer a spatial metric, lateral entorhinal cortex codes temporal progression, and other neurons encode experience content.
  • Hippocampal ensembles encode unique associations between event content, spatial, and temporal contexts.

Conclusions:

  • Neuronal codes in the entorhinal cortex and hippocampus fulfill essential requirements for episodic memory.
  • This coding enables the storage and reactivation of detailed event memories, supporting predictions.