title: Dual-frequency steady-state visual evoked potential for brain computer interface.
abstract: This study presents a new steady-state visual evoked potential (SSVEP) for brain computer interface (BCI) systems. The goal of this study is to increase the number of selections using fewer stimulation frequencies. This study analyzes the SSVEPs induced by six groups of light-emitting diodes (LEDs). The proposed method produces more selections than the number of stimulation frequencies through a suitable combination of dual frequencies for stimulation. Further, the six groups of LEDs are generated by four frequencies. The symmetric harmonic phenomena in this study helps increase recognition efficiency. This study tests seven subjects to verify the feasibility of the proposed method.
authors.affiliation: Department of Electrical Engineering, National Central University, No 300, Zhongda Rd, Zhongli City, Taoyuan County 320, Taiwan, ROC.
authors.forename: Kuo-Kai
authors.initials: KK
authors.lastname: Shyu
authors.forename: Po-Lei
authors.initials: PL
authors.lastname: Lee
authors.forename: Yu-Ju
authors.initials: YJ
authors.lastname: Liu
authors.forename: Jyun-Jie
authors.initials: JJ
authors.lastname: Sie
mesh_terms: D000328:Adult; D001921:Brain / Q000502:physiology; D004569:Electroencephalography; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D014584:User-Computer Interface