In recent years, Brain Computer Interface (BCI) systems based on Steady-State Visual Evoked Potential (SSVEP) have received much attention. This study tries to develop a SSVEP based BCI system that can control a wheelchair prototype in five different positions including stop position. In this study four different flickering frequencies in low frequency region were used to elicit the SSVEPs and were displayed on a Liquid Crystal Display (LCD) monitor using Lab-VIEW. Four stimuli colors, green, red, blue and violet were used to investigate the color influence in SSVEPs. The Electroencephalogram (EEG) signals recorded from the occipital region were segmented into 1 second window and features were extracted by using Fast Fourier Transform (FFT). One-Against-All (OAA), a popular strategy for multiclass SVM, is used to classify SSVEP signals. During stimuli color comparison SSVEP with violet color showed higher accuracy than that with green, red and blue stimuli.
Wolpaw, J.R., Birbaumer, N., Heetderks, W.J., McFarland, D.J., Peckham, P.H., Schalk, G., Donchin, E., Quatrano, L.A., Robinson, C.J. and Vaughan, T.M. (2000) Brain computer interface technology: A review of the first international meeting. IEEE Transactions on Rehabilitation Engineering, 8, 164-173.
Berger, T.W., Chapin, J.K., Gerhardt, G.A., et al. (2007) International assessment of research and development in brain-computer interfaces: Report of the world technology evaluation center. Springer, Berlin.
Cheng, M., Gao, X.R., Gao, S.K. and Xu, D. (2002) Design and implementation of a brain computer interface with high transfer rates. IEEE Transactions on Biomedical Engineering, 49, 1181-1186. http://dx.doi.org/10.1109/TBME.2002.803536
Wang, Y.J., Wang, R.P., Gao, X.R., Hong, B. and Gao, S.K. (2006) A practical VEP-based brain-computer interface. IEEE Transactions on Neural Systems and Rehabilitation Engineering, 14, 234-240. http://dx.doi.org/10.1109/TNSRE.2006.875576
Lalor, E.C., Kelly, S.P., Finucane, C., Burke, R., Smith, R., Reilly, R.B. and McDarby, G. (2005) Steady-state VEP-based brain-computer interface control in an immersive 3D gaming environment. EURASIP Journal on Applied Signal Processing, 2005, 3156-3164. http://dx.doi.org/10.1155/ASP.2005.3156
Muller-Putz, G.R. and Pfurtscheller, G. (2008) Control of an electrical prosthesis with an SSVEP-based BCI. IEEE Transactions on Biomedical Engineering, 55, 361-364. http://dx.doi.org/10.1109/TBME.2007.897815
Lee, P.L., Chang, H.C., Hsieh, T.Y., et al. (2012) A brain wave actuated small robot car using ensemble empiricalmode decomposition based approach. IEEE Transactions on Systems, Man, and Cybernetics, Part A: Systems and Humans, 42, 1053-1064.
Muller-Putz, G.R., Scherer, R., Brauneis, C. and Pfurtscheller, G. (2005) Steady-state visual evoked potential (SSVEP)-based communication: Impact of harmonic frequency components. Journal of Neural Engineering, 2, 123-130. http://dx.doi.org/10.1088/1741-2560/2/4/008
Song-Yun, X., Peng-Wei, W., Hai-Jun, Z. and Hai-Tao, Z. (2008) Research on the classification of brain function based on SVM. The 2nd International Conference on Bioinformatics and Biomedical Engineering, ICBBE 2008, 1931-1934.