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Related Experiment Video

Updated: Jul 15, 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

Postictal single-cell firing patterns in the hippocampus.

Jun-Li Zhou¹, Pierre-Pascal Lenck-Santini, Gregory L Holmes

¹Neuroscience Center at Dartmouth, Section of Neurology, Dartmouth Medical School, Lebanon, New Hampshire, USA.

|April 18, 2007

Summary

Epilepsy seizures disrupt hippocampal place cell activity, causing aberrant spatial memory. This study reveals dynamic remapping of hippocampal circuits post-seizure, not just reduced firing, impacting cognitive function.

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Last Updated: Jul 15, 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

Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury

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Published on: November 19, 2012

Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice

Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice

Published on: July 1, 2018

Area of Science:

Neuroscience
Epilepsy Research
Cognitive Impairment

Background:

Epilepsy causes significant cognitive impairment, including confusion and amnesia, increasing patient burden.
The underlying mechanisms of postictal (after seizure) cognitive deficits remain poorly understood.

Purpose of the Study:

To investigate single-cell firing patterns in the hippocampus following spontaneous seizures in rats with a history of status epilepticus.
To understand the neural basis of postictal cognitive impairment.

Main Methods:

Monitoring of hippocampal CA1 place cells and interneurons before and after spontaneous seizures in six epileptic rats.
Analysis of place cell firing rates, field stability, coherence, and information content.
Assessment of hippocampal remapping through firing field emergence in previously silent cells.

Main Results:

A significant decrease in place cell firing rates was observed post-seizure, while interneuron firing remained stable.
Persistent or returning place cell firing fields exhibited reduced coherence and information content.
Seizures induced remapping of the hippocampus, with new firing fields appearing in previously inactive cells.

Conclusions:

Postictal behavioral changes are not solely due to reduced neuronal firing.
The postictal period involves dynamic and robust alterations in hippocampal cell-firing patterns.
These alterations lead to a remapping of the hippocampal spatial map, contributing to cognitive deficits.