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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 5, 2026

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

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

Published on: August 2, 2017

Human hippocampal theta oscillations reflect sequential dependencies during spatial planning.

Raphael Kaplan^1,2, Adrià Tauste Campo^3,4,5, Daniel Bush^6,7

¹Wellcome Centre for Human Neuroimaging, UCL Institute of Neurology, University College London , London, UK.

Cognitive Neuroscience

|October 17, 2019

Summary

Human hippocampal theta oscillations increase during spatial planning, suggesting a role in evaluating choices. This brain activity was linked to slower, more accurate decisions in novel environments.

Keywords:

Hippocampus one-shot learning planning prospection sequential decision making theta rhythm

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Last Updated: Jan 5, 2026

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

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

Published on: August 2, 2017

Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG

Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG

Published on: March 10, 2017

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

Published on: June 29, 2018

Area of Science:

Neuroscience
Cognitive Science
Spatial Navigation

Background:

Theta oscillations in the rodent hippocampus coordinate spatial trajectory evaluation.
This suggests human hippocampal theta may be involved in assessing upcoming spatial decisions.

Purpose of the Study:

To investigate if human hippocampal theta power increases during the evaluation of spatial choices.
To explore the relationship between theta power, decision speed, and accuracy in a spatial planning task.

Main Methods:

Measured neural oscillations using electroencephalography (EEG) in humans.
Participants performed a spatial planning task involving finding the shortest path in novel mazes with multiple choice points.
Analyzed ~4-8 Hz hippocampal/medial temporal lobe theta power during sequential planning and decision-making.

Main Results:

Observed significant increases in hippocampal/medial temporal lobe theta power specifically during sequential planning.
This theta power increase was negatively correlated with decision speed.
Decision speed was inversely correlated with choice accuracy, indicating slower decisions were more accurate.

Conclusions:

The hippocampal theta rhythm plays a crucial role in decision tree search during the planning of navigation in novel environments.
Findings implicate hippocampal theta in the cognitive processes underlying spatial decision-making and planning.