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Updated: Jul 8, 2025
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Recording Brain Activity with Ear-Electroencephalography
Published on: March 31, 2023
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Wireless and Wearable Auditory EEG Acquisition Hardware Using Around-The-Ear cEEGrid Electrodes
Summary
A new wearable, low-power electroencephalography (EEG) system enables multichannel brainwave recordings outside the lab. This portable device matches and exceeds current standards for auditory brainstem response testing.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Signal Processing
Background:
- Clinical electroencephalography (EEG) requires high temporal resolution data acquisition.
- Existing EEG systems are often lab-bound, limiting real-world applications.
- There is a need for portable, low-power EEG systems for extended use.
Purpose of the Study:
- To design and evaluate a wearable, low-power, multichannel EEG system for use outside laboratory settings.
- To assess the system's performance against a state-of-the-art acquisition system for auditory brainstem responses (ABRs).
Main Methods:
- Developed a portable EEG system using around-the-ear cEEGrid electrodes for 8 biopotential channels.
- Employed low-power instrumentation amplifiers and an analog-to-digital converter (ADC).
- Utilized an ESP32 microcontroller for data capture and SD card storage; compared results with a BioSemi system.
Main Results:
- The portable EEG system successfully acquired multichannel data.
- Performance in capturing auditory brainstem responses (ABRs) met or exceeded the specifications of a state-of-the-art system (BioSemi).
Conclusions:
- The designed wearable EEG system offers a viable alternative for lab-free, high-temporal-resolution EEG acquisition.
- This technology facilitates auditory EEG recordings for hearing diagnostics, prevention, and treatment monitoring.
