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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: Apr 3, 2026

Neural Activity Propagation in an Unfolded Hippocampal Preparation with a Penetrating Micro-electrode Array

Neural Activity Propagation in an Unfolded Hippocampal Preparation with a Penetrating Micro-electrode Array

Published on: March 27, 2015

Early network activity propagates bidirectionally between hippocampus and cortex.

Zeke Barger¹, Curtis R Easton¹, Kevin E Neuzil¹

¹Department of Biology, University of Washington, Seattle, Washington, 98195.

Developmental Neurobiology

|September 20, 2015

Summary

This summary is machine-generated.

The developing brain uses spontaneous activity waves to refine connections. Researchers found the hippocampus can initiate these waves, influencing neocortical development.

Keywords:

astrocyte brain slice cortex hippocampus wave

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Last Updated: Apr 3, 2026

Neural Activity Propagation in an Unfolded Hippocampal Preparation with a Penetrating Micro-electrode Array

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Published on: March 27, 2015

Acute Mouse Brain Slicing to Investigate Spontaneous Hippocampal Network Activity

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Published on: August 28, 2020

Horizontal Hippocampal Slices of the Mouse Brain

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Published on: September 22, 2020

Area of Science:

Neuroscience
Developmental Biology
Computational Neuroscience

Background:

Spontaneous neuronal activity is crucial for refining brain connections during early development.
In the neonatal mouse neocortex, activity waves originate from the septal nucleus and piriform cortex.

Purpose of the Study:

To investigate the hippocampus's role as a potential source of neocortical spontaneous activity waves.
To understand the mechanisms governing wave propagation from the hippocampus to the neocortex.

Main Methods:

High-speed calcium imaging in parasagittal mouse brain slices.
Pharmacological manipulation of GABAergic and glutamatergic neurotransmission.
Electrical stimulation of brain regions.

Main Results:

The hippocampus can initiate spontaneous activity waves that propagate into the neocortex.
GABAergic transmission is necessary for wave propagation into the neocortex, while glutamatergic transmission is essential for hippocampal wave generation.
Hippocampal waves can trigger astrocytic calcium waves, increasing their likelihood of neocortical propagation.
The hippocampus and piriform cortex act as pacemakers due to intrinsic circuit properties.

Conclusions:

The hippocampus is an additional source of neocortical spontaneous activity waves.
Neurotransmitter systems and astrocytic interactions modulate wave propagation.
Intrinsic properties of brain regions dictate their pacemaker function in early brain development.