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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: Mar 17, 2026

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

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Time Cells in Hippocampal Area CA3.

Daniel M Salz¹, Zoran Tiganj¹, Srijesa Khasnabish¹

¹Center for Memory and Brain, Boston University, Boston, Massachusetts 02215.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|July 15, 2016

Summary

Hippocampal CA3 and CA1 neurons both encode time and space, even without memory demands. Temporal coding resolution decreases over time, unlike spatial coding, revealing how the hippocampus organizes experience.

Keywords:

hippocampus memory place cells time cells

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Last Updated: Mar 17, 2026

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

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Published on: October 11, 2017

Area of Science:

Neuroscience
Cognitive Neuroscience
Systems Neuroscience

Background:

Hippocampal time cells, crucial for temporal memory, were previously thought to be exclusive to area CA1.
Some research suggested temporal processing in the hippocampus might be limited to CA1 and CA2, and only under demanding memory conditions.

Purpose of the Study:

To investigate the temporal and spatial coding properties of CA3 and CA1 neurons in rats.
To determine if temporal coding occurs in CA3 and if it is dependent on working memory demands.

Main Methods:

Rats performed a maze task with and without working memory demands.
Neuronal activity in CA3 and CA1 was recorded.
Temporal and spatial coding properties of neurons were analyzed.

Main Results:

CA3 neurons exhibited robust temporal modulation, similar to CA1 time cells, in memory-demanding tasks.
Both CA3 and CA1 showed equivalent temporal and spatial coding robustness, even in tasks without working memory demands.
Temporal coding resolution decreased over time, while spatial coding resolution remained consistent.

Conclusions:

CA1 and CA3 regions of the hippocampus both actively participate in encoding the temporal and spatial organization of experiences.
Temporal and spatial coding mechanisms within the hippocampus share similarities but also exhibit distinct characteristics, particularly in their temporal resolution dynamics.