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Related Experiment Video

Updated: Feb 6, 2026

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Integrating time from experience in the lateral entorhinal cortex.

Albert Tsao1,2, Jørgen Sugar3, Li Lu3,4

  • 1Kavli Institute for Systems Neuroscience and Centre for Neural Computation, NTNU, Trondheim, Norway. albert.tsao@ntnu.no.

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|August 31, 2018
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Summary
This summary is machine-generated.

The lateral entorhinal cortex encodes time across various scales through neural population states, crucial for episodic memory. This temporal encoding is less prominent in other brain regions like the hippocampus.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Memory Research

Background:

  • Episodic memory relies on encoding time and binding it to events.
  • The precise neural mechanisms within hippocampal-entorhinal circuits remain largely unknown.

Purpose of the Study:

  • To investigate how temporal information is encoded in the hippocampal-entorhinal system.
  • To determine the role of the lateral entorhinal cortex in representing time for episodic memory.

Main Methods:

  • Electrophysiological recordings in freely foraging rats.
  • Analysis of neural population activity in the lateral entorhinal cortex, medial entorhinal cortex, and hippocampus (CA3-CA1).
  • Behavioral tasks to manipulate and assess experience similarity across trials.

Main Results:

  • Robust encoding of temporal information across seconds to hours was found in the lateral entorhinal cortex population state.
  • Less pronounced temporal encoding was observed in the medial entorhinal cortex and hippocampus.
  • Constrained behavioral tasks reduced temporal flow encoding but improved trial-start time encoding.

Conclusions:

  • Lateral entorhinal cortex neurons inherently represent time through experience encoding.
  • This temporal representation may integrate with medial entorhinal cortex spatial inputs in the hippocampus.
  • The hippocampus could form unified representations of 'what, where, and when' in episodic memory.