Research / 2022 / Article / Fig 4

Research Article

Ten-Hour Stable Noninvasive Brain-Computer Interface Realized by Semidry Hydrogel-Based Electrodes

Figure 4

(a) Brain mapping of the AgPHMS semidry electrode EEG cap in a BCI system and typing using mVEP mapping. (b) Accuracy of typing during the first hour and the third hour using the AgPHMS semidry electrode and a commercial wet electrode ( for each electrode). (c) Impedance of the AgPHMS semidry electrode system on different channels. (d) The impedance of a commercial wet electrode system on different channels. (e) Ten-hour impedance data of the AgPHMS semidry electrode system. (f) Anti-interference index of the AgPHMS semidry electrode and commercial wet electrode. (g) Release of electrolyte from the AgPHMS semidry electrode. (h) Silver content on the AgPHMS semidry electrode when immersed in electrolyte ( for each sample). (i, j) Biocompatibility test of the AgPHMS semidry electrode using conventional Ag/AgCl gel-based electrodes as the control group. (k) Neither test triggered an allergic reaction after 7 days.