Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (17): 3152-3155.doi: 10.3969/j.issn.1673-8225.2011.17.027

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On-line brain-computer interface system design based on alpha wave and motor imagery

Wang Lei1, Wang Jiang1, Liu Li-fang2, Yang Shuo1, Xu Gui-zhi1, Yan Wei-li1   

  1. 1Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability, Hebei University of Technology, Tianjin  300130, China
    2Clinic Department, Fourth Flying School of Chinese PLA Air Force, Shijiazhuang  050000, Hebei Province, China
  • Received:2010-10-08 Revised:2011-03-10 Online:2011-04-23 Published:2011-04-23
  • About author:Wang Lei☆, Doctor, Lecturer, Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability, Hebei University of Technology, Tianjin 300130, China murhythm@qq.com
  • Supported by:

    the Natural Science Foundation of Hebei Province, No. E2009000062*

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Abstract:

BACKGROUND: At present, most of on-line brain-computer interface (BCI) systems adopt synchronous design, which cannot tell the switch between “active” state and “idle” state. 
OBJECTIVE: To design an effective BCI system design, which is free to switch between “active” state and “idle” state.
METHODS: In this paper, an on-line BCI system was designed based on a series of physiological phenomenon, such as alpha wave-block, event related synchronization (ERS) and event related desynchronization (ERD). Through detecting the EEG recorded from occipital area, the two states being “active” and “idle” could be switched. Under the statement of “active”, EEG captured from motor cortex was processed, and the frequency feature was extracted during different motor imagery tasks, in the end, the mind that user wanted to express was estimated.
RESULTS AND CONCLUSION: The results show that the subject can switch freely between the two states by using this on-line BCI system after training. Using this method, the practicability of on-line BCI system is getting improved greatly.

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