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BCI training system. (A) Illustration of the closed-loop system. This BCI system consists of an EEG amplifier collecting real-time EEG, a PC analyzing EEG signal and providing visual and auditory feedback, and a robot hand providing sensory feedback. (B) The location of EEG electrodes. There were 16 active electrodes placed on the motor and sensory area and a reference electrode placed on the right ear.
