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The appearance of the smart helmet. (a) The top view and (b) the interior view of the smart helmet; the sponge electrodes and the two-layered circuit are inside it. The smart helmet looks the same as an ordinary combat helmet from the top; however, it consists of novel electroencephalographic (EEG) electrodes and an internal two-layer signal processing circuit enabling it to acquire EEG signals and to perform brain–computer interface (BCI) applications.
