关键词: 脑机接口, 脑电信号, 可穿戴设备, 表情, 假手控制

Abstract: Aiming at the shortages of traditional motion imagery(MI) paradigm and steady state visual evoked potential (SSVEP) paradigm in high training difficulty of paradigm, complex equipment integration, high cost, unwearable and so on, a brain control prosthesis method was proposed based on facial expression with the help of the wide adaptability of electroencephalography, high accuracy of recognition and the convenience to integrate in portable system.A portable brain controlled prosthesis system was constructed based on facial expression，including hardware system forming，analytical algorithm design and software developing，to realize the control technique from brow-raising to hand-opening，brow-frowning to hand-closing，left-smirking to wrist-intorsion and right-smirking to wrist-extorsion and its online experiments.The online experimental results of the portable brain controlled prosthesis system indicate that the brain control method for prosthesises based on facial expression is better than SSVEP way in removing the extra inducers，and better than motor imagery way for the average online accuracy rate of recognition and control is over 85%.

Key words: brain computer interface, electroencephalography, wearable device, expression, prosthesis control