Communication using non-invasive brain-computer interface system

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  • Hashimoto Yasunari
    Department of Electrical and Electronic Engineering Kitami Institute of Technology
  • Ushiba Junichi
    Department of Biosciences and Informatics, Faculty of Science and Technology, Keio University
  • Tomita Yutaka
    Keio University Tsukigase Rehabilitation Center
  • Kimura Akio
    Keio University Tsukigase Rehabilitation Center
  • Liu Meigen
    Department of Rehabilitation Medicine, Keio University School of Medicine

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Other Title
  • 頭皮脳波を使ったBMIによるコミュニケーション
  • シンポジウム 頭皮脳波を使ったBMIによるコミュニケーション
  • シンポジウム アタマ ヒ ノウハ オ ツカッタ BMI ニ ヨル コミュニケーション

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Introduction : In the present study, we developed a brain-computer interface（BCI）system that used surface electroencephalographic（EEG）signals recorded over the sensorimotor cortex to investigate long-term effects of BCI use on brain activities in people with severe motor disability. Method : The BCI system estimated the user’s motor intention（MI）in 3 different limb movements : feet, left hand, and right hand detecting event related desynchronization（ERD）in the mu band （around 10 Hz）and event related synchronization（ERS）in beta band（around 20 Hz）. To investigate the long-term effects, we followed BCI use by a chronic tetraplegic subject with muscular dystrophy for a half of a year. Result : The subject was trained to control his avatar via the BCI by strolling in the VR for 1 hour a day and then continued the same training twice a month at his home. We observed changes in ERD and ERS patterns and increases in BCI performance over long-term use of this system. At last, the subject freely strolled and communicated with others users in a virtual world using our BCI system. Discussion : Our results suggest that it is possible to develop BCI systems that allow severely paralyzed patients to communicate with others in a virtual world in the same way as a healthy person. The present study also revealed that long-term of BCI use caused plastic change of brain activities. This result suggested the possibility that BCI can be not only a substitute of a part of body but also a rehabilitation tool.

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