Greta Tuckute*
The lack of suitable EEG electrodes for hairy sites is one of the main obstacles to daily wearable electroencephalogram (EEG) monitoring. Wet anodes require conductive gels, which will dry over the procurement time, making them shaky for long haul EEG checking. Additionally, the majority of dry electrodes' electrode–scalp impedances are insufficient for high-quality EEG collection at hairy locations. This study proposes a flexible multi-layer semi-dry electrode for EEG monitoring in light of the aforementioned issues. A reservoir layer, a foam layer, and a flexible electrode body layer make up the semi-dry electrode. The body layer of the electrode has a probe structure that lets the electrode work well at hairy locations. Electrolytes stored in the reservoir layer are continuously released through the foam layer to the electrode–scalp interface during long-term EEG monitoring, resulting in a lower contact impedance between the electrode and the scalp. The semi-dry electrode performed well in both static and dynamic EEG monitoring, where the temporal correlation with wet electrode signals at the hairy site could reach 94.25% and 90.65%, respectively, and specific evoked EEG signals could be collected. The experimental results showed that the average electrode–scalp impedance of the semidry electrode at a hairy site was only 23.89 7.44 K at 10 Hz, and it was less than 40 K over a long-term use of 5 The multi-layer, flexible semi-dry electrode is a promising option for daily, long-term monitoring of wearable EEGs at hairy locations on the scalp.
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