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Role of Hippocampus in Memory

Role of Hippocampus in Memory

The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...

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Related Experiment Video

Updated: Jan 11, 2026

Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording

Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording

Published on: August 11, 2019

Hippocampal OLM interneurons regulate CA1 place cell plasticity and remapping.

Matt Udakis¹, Matthew D B Claydon¹, Heng Wei Zhu¹

¹School of Physiology, Pharmacology and Neuroscience, University Walk, University of Bristol, Bristol, UK.

Nature Communications

|November 11, 2025

Summary

Olmsted (OLM) interneurons regulate hippocampal place cell plasticity. Reducing OLM activity in new environments aids new place cell formation, while increasing it stabilizes existing representations.

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Last Updated: Jan 11, 2026

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Published on: August 11, 2019

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Published on: November 20, 2018

Area of Science:

Neuroscience
Hippocampal circuitry
Synaptic plasticity

Background:

Olmsted (OLM) interneurons uniquely target distal dendrites of CA1 pyramidal cells.
The function of this specific targeting in place cell physiology is not well understood.

Purpose of the Study:

To investigate the role of OLM interneuron activity in regulating synaptic plasticity and place cell representations in the hippocampus.
To determine how OLM activity changes in novel versus familiar environments.

Main Methods:

In vivo electrophysiology in mice.
Manipulation of OLM interneuron activity.
Analysis of synaptic plasticity at Schaffer collateral synapses.
Assessment of dendritic calcium (Ca2+) signaling.

Main Results:

OLM activity inhibits associative synaptic plasticity at Schaffer collateral synapses by suppressing dendritic Ca2+ signaling.
OLM activity is reduced in novel environments, facilitating excitatory synaptic plasticity.
Increased OLM activity in novel environments enhances place cell stability and reduces remapping.
Increased OLM activity in familiar environments causes transient place cell silencing.

Conclusions:

Distal dendrite-targeting OLM interneurons play a crucial role in controlling synaptic plasticity and neuronal representation stability.
Modulation of OLM activity is vital for the formation and stability of hippocampal place cell representations, particularly in response to environmental novelty.