骨传导听觉脑机接口技术研究

听觉脑机接口技术为视觉通路存在障碍的闭锁综合征患者提供了与外界交流的新通道.为了使空气传导通路受损的病患也能应用此项技术，本文将声音骨传导方式引入到听觉脑机接口实验研究中.本研究设计了左右耳分别呈现不同声音序列的双耳分听实验范式，对骨传导及空气传导方式所诱发脑电信号进行了特征提取和分类比较.实验结果表明两种传导方式下靶刺激均可稳定的诱发出N200与P300电位，骨传导方式下，N200的幅值较空气传导方式更显著.两种方式都获得较高的分类正确率，均可用于听觉脑机接口系统，且骨传导方式优于空气传导方式.

Auditory Brain-Computer Interfaces Based on Bone Conduction

Auditory brain-computer interfaces (BCIs) provide a means of non-muscular communication for locked-in state (LIS) patients who have compromised vision or lose the control of their eye movement.The bone-conduction paradigm was introduced into the auditory brain computer interface technology,so that patients with impaired air conduction pathway can also use this technology.It designs a dichotic listening paradigm by playing different sound stimulation sequences to both ears at the same time.The feature extraction and classification of EEG signals induced by bone conduction and air conduction.The results showed that targets elicited N200 and P300 component.EEG data has shown that the amplitude of N200 elicited by bone condition target was significantly higher than that of air condition target ones.These proposed methods both have high discriminant accuracy,the bone-conduction method is better than the air conduction method and can be used for auditory brain computer interface systems.