Contact Pressure and Flexibility of Multipin Dry EEG Electrodes

摘要: In state-of-the-art electroencephalography (EEG) Silver/Silver-Chloride electrodes are applied together with electrolyte gels or pastes. Their application requires extensive preparation, trained medical staff and limits measurement time mobility. We recently proposed a novel multichannel cap system for dry EEG mobile out-of-the-lab acquisition. During the tests these polymer-based multipin electrodes, we observed that quality of recording depends on normal force resulting contact pressure. Consequently, in this paper systematically investigate influence electrode-skin pressure electrode substrate flexibility interfacial impedance perceived wearing comfort study 12 volunteers. The to was varied between minimum required achieve impedances $ maximum 4 N, using new applicator. found polymer shore hardness A98, increasing force, decreases from $348~\pm ~236~\text{k}\Omega $257~\pm ~207~\text{k}\Omega $29~\pm ~14~\text{k}\Omega $23~\pm ~11~\text{k}\Omega at frontal hairless temporal hairy positions, respectively. Similar results were obtained A90, A80, A70. best compromise low stable as well good determined forces 2 3 N A98 A90. Our provide basis improved designs optimal which will enable fields EEG.