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Object and object-memory representations across the proximodistal axis of CA1

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Brianna Vandrey, Stephen Duncan, James Alexander Ainge

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Abstract

Episodic memory requires information about objects to be integrated into a spatial framework. Place cells in the hippocampus encode spatial representations of objects that could be generated through signaling from the entorhinal cortex. Projections from lateral (LEC) and medial entorhinal cortex (MEC) to the hippocampus terminate in distal and proximal CA1, respectively. We recorded place cells in distal and proximal CA1 as rats explored an environment that contained objects. Place cells in distal CA1 demonstrated higher measures of spatial tuning, stability, and closer proximity of place fields to objects. Furthermore, remapping to object displacement was modulated by place field proximity to objects in distal, but not proximal CA1. Finally, representations of previous object locations were closer to those locations in distal CA1 than proximal CA1. Our data suggest that in cue‐rich environments, LEC inputs to the hippocampus support spatial representations with higher spatial tuning, closer proximity to objects, and greater stability than those receiving inputs from MEC. This is consistent with functional segregation in the entorhinal–hippocampal circuits underlying object‐place memory.
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Original languageEnglish
Number of pages16
JournalHippocampus
VolumeEarly View
Early online date4 May 2021
DOIs
Publication statusE-pub ahead of print - 4 May 2021

    Research areas

  • CA1 region, Entorhinal cortex, Episodic memory, Hippocampus, Place cell, Spatial memory

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