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Related Experiment Video

Updated: Jun 16, 2026

Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices
10:35

Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices

Published on: March 15, 2018

CA3 transiently modulates spatial representation in CA1.

Cynthia Rais1, Maxime Maheu2, J Simon Wiegert3

  • 1Research Group Synaptic Wiring and Information Processing, Center for Molecular Neurobiology Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.

Progress in Neurobiology
|June 13, 2026
PubMed
Summary

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This summary is machine-generated.

Stimulating CA3 input to CA1 neurons in mice transiently altered the hippocampal spatial code. This induced new place cells and shifted existing ones, but the effects were temporary, impacting spatial map integrity.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Spatial Navigation

Background:

  • The hippocampus is crucial for spatial memory and navigation.
  • Neuronal representations of space are dynamic and can rapidly remap.
  • CA3 input to CA1 is implicated in synaptic plasticity and spatial code remapping.

Purpose of the Study:

  • To investigate the direct contribution of CA3 input to CA1 place field formation and remapping.
  • To understand how CA3 stimulation modulates the hippocampal spatial code.

Main Methods:

  • Longitudinal two-photon calcium imaging of CA1 place cells in mice.
  • Optogenetic stimulation of presynaptic CA3 neurons.
  • Mice ran on a linear treadmill to assess spatial coding.
Keywords:
2-photon place cell imagingCA1 place cell remappingCA3-CA1 synaptic inputOptogenetic stimulationSpatial navigation

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Longitudinal Two-Photon Imaging of Dorsal Hippocampal CA1 in Live Mice
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Longitudinal Two-Photon Imaging of Dorsal Hippocampal CA1 in Live Mice

Published on: June 19, 2019

Related Experiment Videos

Last Updated: Jun 16, 2026

Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices
10:35

Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices

Published on: March 15, 2018

Longitudinal Two-Photon Imaging of Dorsal Hippocampal CA1 in Live Mice
09:34

Longitudinal Two-Photon Imaging of Dorsal Hippocampal CA1 in Live Mice

Published on: June 19, 2019

Main Results:

  • CA3 activation induced a small number of new CA1 place cells.
  • Existing CA1 place fields were shifted without changes in precision or tuning.
  • These CA3-induced changes in the spatial code were transient, largely resolving by the next day.

Conclusions:

  • CA3 input transiently modulates CA1's representation of allocentric space.
  • CA3 stimulation leads to a temporary disruption of the spatial map.
  • The findings clarify the role of CA3-CA1 circuitry in hippocampal spatial coding dynamics.