Stick-and-play bioadhesive hairlike electrodes for chronic EEG recording on human

This study reports the design and fabrication of bioadhesive, hairlike electrodes that enable stable, long-term electroencephalogram (EEG) recording from the human scalp without the use of conductive gels or skin preparation. Using a combination of flexible conductive polymer hydrogels and a robust bioadhesive layer, the hairlike devices achieve intimate conformal contact with the scalp even in the presence of dense hair. Mechanical and electrical characterization demonstrated high stretchability, strong adhesion, and stable electrode–skin impedance over repeated mechanical loading cycles and extended wear times. Human subject testing confirmed high-fidelity EEG signal acquisition over 24 hours, highlighting the potential of these devices for chronic neural monitoring and wearable neurotechnology applications.