Motion Artifacts in Dynamic EEG Recordings: Experimental Observations, Electrical Modelling, and Design
Alessandra Giangrande1,2, Alberto Botter1, Harri Piitulainen2
1Laboratory of Neuromuscular System and Rehabilitation Engineering, Department of Electronics and Telecommunications, Politecnico di Torino, 10129 Turin, Italy.
Sensors (Basel, Switzerland)
|October 16, 2024
Summary
Motion artifacts in electroencephalography (EEG) recordings hinder dynamic applications. This study identifies cable connections and electrode-skin impedance changes as key sources, suggesting improvements in electrode technology and interfacing.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Signal Processing
Background:
- Innovative electroencephalography (EEG) systems face limitations in dynamic applications due to motion artifacts.
- Motion artifacts compromise the interpretation of EEG signals, necessitating research into their origins.
Purpose of the Study:
- To investigate the genesis of motion artifacts in EEG recordings.
- To identify and model sources of motion artifacts within the biopotential acquisition chain.
- To propose solutions for mitigating motion artifacts in EEG technology.
Main Methods:
- Identified three potential sources of motion artifacts: skin-electrode interface, connecting cables, and electrode-amplifier system.
- Modeled artifact sources based on experimental observations of EEG signals.
- Designed customized EEG electrode systems to isolate and study artifact causes.
Main Results:
- Experimental and analytical observations pinpointed two primary sources of residual motion artifacts.
- Key artifact sources identified as connecting cables and changes in electrode-skin impedance due to movement.
- Demonstrated the impact of electrode movement on signal integrity.
Conclusions:
- Further advancements in EEG technology should prioritize the transduction stage of biopotential amplification.
- Focus should be placed on improving electrode technology and its integration with acquisition systems.
- Optimizing electrode-amplifier interfacing is crucial for reducing motion artifacts.
