A mobile brain-based device BBD includes a mobile base equipped with sensors and effectors, which is guided by a simulated nervous system that is an analogue of cortical and sub-cortical areas of the brain required for visual processing, decision-making, reward, and motor responses. The inside wall of the nozzle hole is formed by multiple grooves extending in the fuel jet direction and flat portions between these grooves, and inside walls of the grooves are coated with an oil repellant coating and the flat portions are coated with a lipophilic coating. A volume resistivity RC of a transfer member of the transfer device is smaller than RA and RB under any temperature or humidity environment.