Equivalency between emulated disc electrodes and conventional disc electrode human electroencephalography.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Signal Processing

Background:

• Traditional electroencephalography (EEG) using disc electrodes has limitations in spatial resolution and signal-to-noise ratio.
• Tripolar concentric ring electrode (TCRE) Laplacian electroencephalography (tEEG) has previously demonstrated improved signal characteristics over standard EEG.
• Investigating concurrent signal acquisition from different TCRE configurations is crucial for optimizing EEG-based neuroimaging.

Purpose of the Study:

• To compare electroencephalography (EEG) signals acquired simultaneously from the outer ring of the TCRE (oTCRE), shorted TCRE (sTCRE), and disc electrodes.
• To evaluate the feasibility of using the oTCRE for concurrent EEG and tEEG recordings at the same scalp location.
• To assess the signal similarity between different electrode configurations using correlation and coherence analyses.

Main Methods:

• Simultaneous acquisition of EEG signals using oTCRE, sTCRE, and disc electrodes from nearly identical scalp positions.
• Calculation of average time-series correlation between signal pairs.
• Computation of average coherence over pass-band frequencies for all signal pairs.

Main Results:

• All calculated correlations between the signal pairs were above 0.99.
• All calculated coherences over the pass-band frequencies between signal pairs were above 0.99.
• Demonstrated high signal similarity across the evaluated electrode configurations.

Conclusions:

• The outer ring of the TCRE (oTCRE) can effectively record electroencephalography (EEG) signals.
• Concurrent recording of EEG and tripolar concentric ring electrode Laplacian electroencephalography (tEEG) is feasible using the oTCRE at a single location.
• The findings support the integration of oTCRE for advanced neurophysiological monitoring, offering enhanced spatial resolution and signal quality.