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Related Experiment Video

Updated: Feb 24, 2026

Micropatterning Transmission Electron Microscopy Grids to Direct Cell Positioning within Whole-Cell Cryo-Electron Tomography Workflows
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Reproducible and predictable reorganization of place fields driven by grid subfield rate changes.

Christine M Lykken1,2, Benjamin R Kanter1,2, Jasmine Kaslow2

  • 1Kavli Institute for Systems Neuroscience and Centre for Algorithms in the Cortex, Norwegian University of Science and Technology, Olav Kyrres gate 9, 7030 Trondheim, Norway.

Biorxiv : the Preprint Server for Biology
|February 23, 2026
PubMed
Summary

Researchers found that stimulating specific brain cells in the medial entorhinal cortex (MEC) consistently altered spatial maps in the hippocampus. This suggests stable connections between these brain regions are crucial for spatial memory.

Keywords:
chemogeneticsgrid cellshippocampusmedial entorhinal cortexplace cells

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • The hippocampus creates spatial maps using place cells, which reorganize in new environments (remapping).
  • The medial entorhinal cortex (MEC) influences hippocampal place cells via grid cells, thought to be key for spatial representation.
  • Previous work showed altering MEC cell activity caused artificial remapping in the hippocampus.

Purpose of the Study:

  • To determine if artificial remapping induced by MEC manipulation is a stable process.
  • To investigate the consistency of information transfer from MEC to the hippocampus.
  • To understand the relationship between grid cell activity and hippocampal place cell reorganization.

Main Methods:

  • Chemogenetic manipulation of MEC layer II stellate cells on consecutive days.
  • Recording of grid cell subfield firing rates and hippocampal place cell activity.
  • Analysis of experimental data alongside computational simulations.
  • Predicting place field locations based on baseline place cell activity.

Main Results:

  • Stimulating the same MEC stellate cells on different days produced reproducible changes in grid subfield rates and place field locations.
  • Baseline hippocampal place cell activity patterns could predict place field locations after manipulation.
  • Artificial remapping reflects a consistent input-output relationship, not random reorganization.

Conclusions:

  • Grid subfield rate changes in the MEC consistently drive specific reorganizations in hippocampal spatial representations.
  • This study provides direct evidence for stable, predictable information transfer within the entorhinal-hippocampal circuit.
  • MEC grid cell dynamics play a critical role in the flexibility and stability of hippocampal spatial mapping.