A mini-cap for simultaneous EEG and fMRI recording in rodents

Area of Science:

• Neuroscience
• Biomedical Engineering
• Animal Models

Background:

• Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) is crucial for studying brain functions.
• Existing human EEG-fMRI technology faces limitations in rodents due to small scalp area and electrode proximity to brain tissue, restricting electrode count.
• Previous rodent EEG-fMRI studies were constrained, hindering comprehensive brain activity analysis.

Purpose of the Study:

• To introduce a novel EEG mini-cap and protocol for whole-scalp EEG recordings simultaneously with 7 Tesla (7 T) fMRI in rodents.
• To address technical challenges in rodent EEG-fMRI acquisition.
• To establish a robust experimental platform for advanced neuroscience research in rodents.

Main Methods:

• Development of a new EEG mini-cap designed for rodent anatomy.
• Establishment of a detailed methodological protocol for simultaneous EEG and 7 T fMRI recording in rodents.
• Validation of the methodology using a forepaw stimulation paradigm in Wistar rats.

Main Results:

• Successful implementation of whole-scalp EEG recordings concurrently with 7 T fMRI signals in rodents.
• Demonstration of high quality and reproducibility for both EEG and fMRI signals.
• Quantitative analysis confirmed minimal signal loss during simultaneous recordings.

Conclusions:

• Simultaneous EEG-fMRI recordings in rodents are feasible without significant signal degradation.
• The developed methodology provides a powerful experimental platform for rodent research.
• This advancement supports future studies using transgenic models and advanced drug administration protocols in rodents.