Comparison of Sub-Scalp EEG and Endovascular Stent-Electrode Array for Visual Evoked Potential Brain-Computer...

Area of Science:

• Neuroscience
• Biomedical Engineering

Background:

• Brain-computer interfaces (BCI) offer improved quality of life for individuals with paralysis.
• Sub-scalp electroencephalography (EEG) is an alternative signal acquisition method for BCIs, balancing traditional EEG limitations with invasive electrode risks.
• Sub-scalp EEG has demonstrated potential in long-term seizure monitoring but requires assessment for BCI suitability.

Purpose of the Study:

• To evaluate the suitability of sub-scalp EEG electrodes for BCI applications.
• To compare signal characteristics of sub-scalp electrodes with endovascular stent electrodes for BCI signal acquisition.

Main Methods:

• A preliminary comparative study was conducted using a sheep model.
• Visual evoked potentials (VEPs) were recorded using both sub-scalp and endovascular stent electrodes.
• Signal analysis focused on VEP amplitude, signal-to-noise ratio (SNR), and bandwidth.

Main Results:

• Sub-scalp electrodes demonstrated comparable VEP amplitude to stent electrodes.
• Signal-to-noise ratio (SNR) and bandwidth recorded by sub-scalp electrodes were similar to those of stent electrodes.
• This marks the first reported comparison between sub-scalp and stent electrode array signals.

Conclusions:

• Sub-scalp EEG electrodes exhibit comparable performance to stent electrodes for BCI signal acquisition.
• Sub-scalp EEG presents a viable option for long-term BCI applications.
• This technology may enhance the usability and accessibility of brain-computer interfaces for individuals requiring assistive technology.