Dual Extracellular Recordings in the Mouse Hippocampus and Prefrontal Cortex

Dechuan Sun; Mona Amiri; Luke Weston; Chris French

doi:10.3791/66003

Enregistrements extracellulaires doubles dans l’hippocampe et le cortex préfrontal de la souris

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Neuroscience

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JoVE Journal Neuroscience

Dual Extracellular Recordings in the Mouse Hippocampus and Prefrontal Cortex

Enregistrements extracellulaires doubles dans l’hippocampe et le cortex préfrontal de la souris

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04:44 min

February 16, 2024

DOI: 10.3791/66003-v

Dechuan Sun^1,2, Mona Amiri¹, Luke Weston^1,2, Chris French¹

¹Neural Dynamics Laboratory, Department of Medicine,The University of Melbourne, ²Department of Electrical and Electronic Engineering,The University of Melbourne

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Overview

This protocol details the use of a custom-designed recording device and electrodes to perform dual, electrode local field potential (LFP) recordings in the mouse hippocampus and prefrontal cortex. The study investigates the impact of drug administration on LFP characteristics, contributing to our understanding of cognitive functions in these brain areas.

Key Study Components

Area of Science

Electrophysiology
Cognitive Neuroscience
Neuropharmacology

Background

Local field potentials are crucial for understanding neural communication.
Research in the hippocampus and prefrontal cortex aids in elucidating cognitive processes.
The study utilizes a low-cost and ultra-light device for high-signal noise recordings.
This protocol supports understanding interregional communication in cognitive research.

Purpose of Study

To establish a method for investigating drug effects on LFP properties.
To facilitate recording and analyzing neural signals across different brain regions.
To provide a protocol that enhances the understanding of brain function through recorded LFPs.

Methods Used

The study utilizes a custom-designed recording device for LFP recordings.
Mouse subjects are used as a biological model, specifically focusing on hippocampus and prefrontal cortex regions.
The protocol involves precise implantation of electrodes following surgical procedures.
A comprehensive recording setup is initiated after a recovery period, followed by drug administration and subsequent signal recording.
Detailed electrode preparation and alignment instructions ensure optimized signal acquisition.

Main Results

Significant reductions in gamma band power were observed following administration of retigabine and clozapine.
Four aminopyridine administration resulted in increased gamma band power and coherence in the targeted brain areas.
Findings underscore the impact of drugs on LFP characteristics, suggesting alterations in neural communication.

Conclusions

This study demonstrates a valuable approach to investigate the effects of pharmacological agents on local field potentials.
Insights gained could inform understanding of cognitive functions and interregional brain connectivity.
The protocol holds promise for future studies exploring the neuronal mechanisms underlying cognition and pharmacological influences.

Frequently Asked Questions

What are the advantages of using this custom recording device?

This device is designed to be low-cost and ultra-light, making it ideal for cognitive research in mice while ensuring high-signal noise ratios.

How are the electrodes implanted in the mouse?

Electrodes are surgically implanted following a specific protocol that includes anesthetizing the mouse, making incisions, and careful placement according to anatomical landmarks.

What types of data are collected using this protocol?

The protocol allows for the collection of local field potentials from specific brain areas, providing insights into neural communication and the effects of pharmacological agents.

How can this method be adapted for other studies?

The custom design can be modified to include different electrode configurations or to study other brain regions, making it versatile for various research questions.

What limitations should researchers consider when using this protocol?

Researchers should consider the need for precision in electrode placement and the effects of anesthesia on neural activity during data collection.

How does this study contribute to understanding cognitive processes?

By revealing how drug administration affects local field potentials, this study enhances understanding of the neural mechanisms underlying cognitive processes in the brain.

What role do local field potentials play in neuroscience research?

Local field potentials are essential for studying synaptic interactions and brain communication, providing a window into the functional state of neural circuits.

Ce protocole décrit l’utilisation d’un appareil d’enregistrement conçu sur mesure et d’électrodes pour enregistrer les potentiels de champ locaux et étudier le flux d’information dans l’hippocampe et le cortex préfrontal de la souris.

Cette étude présente un protocole complet pour effectuer des enregistrements LFP à deux électrodes dans l’hippocampe de la souris et le cortex préfrontal afin d’étudier les effets des médicaments sur les propriétés LFP dans ces zones. Ce protocole fournit un appareil d’enregistrement de signaux cérébraux peu coûteux et ultra-léger, entièrement optimisé pour la recherche cognitive chez la souris. Cette étude fournit un moyen d’enregistrer des signaux avec des rapports signal-bruit élevés dans différentes régions du cerveau, facilitant ainsi l’étude de la communication interrégionale de l’information dans le cerveau.

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