ABSTRACT Noninvasive wearable stimulation‐acquisition integrated brain–computer interfaces (BCIs) have significant application value in neurological rehabilitation and health monitoring. However, their widespread adoption depends on the development of long‐term, stable dry/semi‐dry electrodes and lightweight hardware. In this study, a sodium‐doped vertical graphene (Na‐VG) electrode that utilized sweat and tissue fluids as electrolytes was developed. When applied with ultrapure water, an extremely low electrode‐skin impedance of 4.22 ± 0.50 kΩ was detected at 10 Hz. The 20‐channel EEG cap assembled with the Na‐VG electrodes maintained a high α ‐rhythm response of 5.06–14.22 dB in the signal‐to‐noise ratio of whole‐brain EEG signals during a 36‐day stability evaluation. Furthermore, a wearable Na‐VG headband BCI combining sound–light stimulation and EEG acquisition was developed. Healthy individuals wearing this system, under the coordinated intervention of 40 Hz differential‐frequency sound stimulation and 10 Hz light stimulation, showed changes in the frequency and amplitude of the α ‐rhythm. This improvement increased the proportion of moderate‐levels of the vigilance index, neural activity, heart rate, emotion, and arousal index to 84–100%, with a precision of 98.73%. These results provide novel long‐term, lightweight strategies and matching software and hardware for the monitoring and noninvasive intervention of emotional and cognitive‐related diseases.
Ma et al. (Fri,) studied this question.