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Related Experiment Video

Updated: Apr 9, 2026

Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
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Spatial and semantic memory reorganize a hippocampal long-axis gradient.

Anikka G Jordan1, Joel L Voss1, James E Kragel1

  • 1Department of Neurology, University of Chicago, Chicago, IL 60637.

Proceedings of the National Academy of Sciences of the United States of America
|April 7, 2026
PubMed
Summary
This summary is machine-generated.

The hippocampus organizes spatial and semantic memory dynamically. It uses both continuous gradients and specialized subregions, adapting its structure to memory demands for episodic memory.

Keywords:
connectivityfMRIhippocampuslong axismemory

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neuroimaging

Background:

  • The hippocampus is crucial for episodic memory, integrating spatial and semantic information.
  • The organization of this information along the hippocampus's long axis is debated, with gradient and modular models offering competing explanations.

Purpose of the Study:

  • To investigate the competing gradient and modular accounts of hippocampal organization during episodic memory formation.
  • To determine how spatial and semantic information are represented along the hippocampus's long axis.

Main Methods:

  • High-resolution functional magnetic resonance imaging (fMRI) was employed.
  • Eye tracking was used to monitor spatial and semantic memory during sequence learning tasks.

Main Results:

  • Hippocampal activity showed a continuous gradient along the long axis during predictable sequences.
  • A modular organization emerged during sequences that mismatched memory, with distinct subregions showing sensitivity to spatial or semantic errors.
  • The intermediate hippocampus specifically responded to concurrent spatial and semantic mismatches.

Conclusions:

  • The hippocampus exhibits a dynamic architecture that flexibly combines gradient and modular principles.
  • This dual organizational strategy allows for the simultaneous representation of spatial and semantic content essential for episodic memory.
  • Cortical networks associated with hippocampal subregions dynamically reorganize based on memory task requirements.