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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: Jun 14, 2026

Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice

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Published on: July 1, 2018

Bidirectional changes to hippocampal theta-gamma comodulation predict memory for recent spatial episodes.

Prasad R Shirvalkar¹, Peter R Rapp, Matthew L Shapiro

¹Fishberg Department of Neuroscience, Mount Sinai School of Medicine, New York, NY 10029, USA.

Proceedings of the National Academy of Sciences of the United States of America

|March 31, 2010

Summary

This summary is machine-generated.

Theta-gamma comodulation in the hippocampus predicts spatial memory performance. This brain rhythm pattern is crucial for memory retrieval and may offer therapeutic targets for cognitive disorders.

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Last Updated: Jun 14, 2026

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Published on: July 1, 2018

Tuning in the Hippocampal Theta Band In Vitro: Methodologies for Recording from the Isolated Rodent Septohippocampal Circuit

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Published on: November 19, 2012

Area of Science:

Neuroscience
Cognitive Science
Memory Research

Background:

Episodic memory relies on the hippocampus for integrating cortical information into memory traces.
Hippocampal local field potentials (LFPs) exhibit oscillations that may orchestrate neural plasticity and memory formation.

Purpose of the Study:

To investigate the relationship between hippocampal theta-gamma comodulation (TGC) and spatial memory performance in rats.
To explore the causal role of TGC in memory retrieval and its potential modulation through brain stimulation.

Main Methods:

Recording of hippocampal LFPs during a spatial memory task in rats.
Assessment of single-trial memory performance correlated with theta-gamma power comodulation.
Pharmacological manipulation (muscimol infusion) and electrical stimulation (fimbria-fornix) to alter TGC and memory.

Main Results:

Single-trial spatial memory success was predicted by prominent theta-gamma comodulation (TGC) in the hippocampus.
Reduced TGC and memory retrieval were observed after muscimol infusion into the medial septum.
Electrical stimulation enhanced TGC in amnesic rats and improved water maze performance.

Conclusions:

Theta-gamma comodulation is a key neural signature associated with hippocampal memory retrieval.
Modulating TGC through brain stimulation presents a potential therapeutic avenue for memory impairments in cognitive disorders.