Journal
RESEARCH
Volume 2022, Issue -, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.34133/2022/9830457
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Funding
- Fundamental Research Funds for the Central Universities [2021XD-A04-1]
- Basic Science Center Program of the National Natural Science Foundation of China (NSFC) [51788104]
- Beijing Natural Science Foundation [JQ19005]
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In this study, a semidry EEG electrode, using silver-nanowire/PVA hydrogel/melamine sponge materials, was developed for long-lasting monitoring of EEG signal. The electrode has high conductivity, long-term effectiveness, and biocompatibility, and can reduce scalp-electrode impedance and improve wearing comfort. The experiment demonstrated that the accuracy of the new electrode is comparable to that of conventional electrodes in long-term applications measuring motion-onset visual evoked potentials.
Noninvasive brain-computer interface (BCI) has been extensively studied from many aspects in the past decade. In order to broaden the practical applications of BCI technique, it is essential to develop electrodes for electroencephalogram (EEG) collection with advanced characteristics such as high conductivity, long-term effectiveness, and biocompatibility. In this study, we developed a silver-nanowire/PVA hydrogel/melamine sponge (AgPHMS) semidry EEG electrode for long-lasting monitoring of EEG signal. Benefiting from the water storage capacity of PVA hydrogel, the electrolyte solution can be continuously released to the scalp-electrode interface during used. The electrolyte solution can infiltrate the stratum corneum and reduce the scalp-electrode impedance to 10 k Omega-15 k Omega. The flexible structure enables the electrode with mechanical stability, increases the wearing comfort, and reduces the scalp-electrode gap to reduce contact impedance. As a result, a long-term BCI application based on measurements of motion-onset visual evoked potentials (mVEPs) shows that the 3-hour BCI accuracy of the new electrode (77% to 100%) is approximately the same as that of conventional electrodes supported by a conductive gel during the first hour. Furthermore, the BCI system based on the new electrode can retain low contact impedance for 10 hours on scalp, which greatly improved the ability of BCI technique.
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