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Entorhinal cortex represents task-relevant remote locations independently of CA1.

Emily A Aery Jones1,2, Isabel I C Low3,4, Frances S Cho3

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During immobility, medial entorhinal cortex (MEC) neurons frequently represent remote locations, not just the current one. This nonlocal coding may strengthen learned associations between places independently of the CA1 region.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Spatial Navigation

Background:

  • Neurons in the medial entorhinal cortex (MEC) are known to encode an animal's location during movement.
  • However, the function of MEC neural representations during periods of immobility remains largely unexplored.
  • Existing research suggests remote neural representations can support learning and reflect learned associations.

Purpose of the Study:

  • To investigate the nature of medial entorhinal cortex (MEC) neural representations during immobility.
  • To determine if MEC neurons exhibit nonlocal coding (representing locations other than the animal's current position) during immobility.
  • To explore the relationship between MEC nonlocal coding, learning associations, and the CA1 region.

Main Methods:

  • Simultaneous recording of hundreds of neurons in the MEC and CA1 regions of mice.
  • Mice were trained to associate pairs of rewarded locations.
  • Analysis of neural population activity during both movement and immobility, with and without sharp-wave ripples.

Main Results:

  • MEC neural populations frequently engaged in nonlocal coding during immobility, representing distant locations.
  • Cells with spatial firing fields at remote locations were identified as drivers of this nonlocal coding.
  • Nonlocal coding occurred more often outside of sharp-wave ripples and showed less coordination with CA1 activity compared to previous findings.
  • Remote task-relevant locations were preferentially represented during nonlocal coding at appropriate times.

Conclusions:

  • MEC nonlocal coding during immobility is a prevalent phenomenon, distinct from its role during sharp-wave ripples.
  • This nonlocal representation may serve to strengthen associations between learned locations independently of the CA1 region.
  • MEC's capacity for nonlocal coding during immobility highlights its potential role in associative learning and memory consolidation.