EEG sensor system development consisting of solid polyvinyl alcohol–glycerol–NaCl contact gel and 3D-printed, silver-coated polylactic acid electrode for potential brain–computer interface use

The paper describes the development of a reusable electrode system for non-invasive brain–computer interface application with signal quality comparable to that conventional wet Ag/AgCl electrodes. innovative consists polyvinyl alcohol–glycerol–NaCl contact hydrogel and 3D-printed, silver-coated polylactic acid body. Advantageous features proposed are comfortable use, reusability, long shelf life, alterable geometry. electrical properties freshly prepared aged gels, as well different gel/silver interfaces, were separately characterized, showing much lower impedance values than those measured at electrode–skin complete system. Acceptability limits relevant electroencephalographic measurements, such signal-to-noise ratio during steady-state visually evoked potential measurements band alpha wave detection, have proven applicability