Research on Brain-Computer Interface Technology Based on Steady State Visual Evoked Potentials

A Brain-Computer Interface (BCI) system based on Steady State Visual Evoked Potentials (SSVEP) was presented in this paper to realize four-direction motion control of a small ball on the computer screen. The system mainly included five parts of visual stimulator, electroencephalogram (EEG) amplifier, EEG acquisition, EEG processing and machine human interface on the computer screen. The system utilized wavelet packet decomposition technology and linear classifier to obtain the features of SSVEP and converted them to the control commands. Comparing with FFT method , the wavelet packet technology can achieve better performance.The experimental results have proved the effectiveness of the system. The realization of the system can provide a new way to enhance the human capability to control external device.