title: Multi-command SSVEP-based BCI system via single flickering frequency half-field stimulation pattern.
abstract: This paper proposes a half-field steady state visual evoked potential (SSVEP)-based brain-computer interface (BCI) system to enhance the number of limited commands obtained from the existing SSVEP-based BCI methods. With the theory of vision perception and the concept of the existing half-field SSVEP-based BCI system, we propose the new stimulation pattern that, by using only one frequency, four commands can be generated with the average classification accuracy of approximately 77%. By using only one frequency, eye fatigue can be reduced. Furthermore, this method can be efficiently used to further increase the number of commands for the existing SSVEP-based BCI system.
authors.affiliation: Department of Biomedical Engineering, Mahidol University, 25/25 Putttamonthon 4, Salaya, Nakornpathom 73170, Thailand. yunyong_pd@hotmail.com
authors.forename: Yunyong
authors.initials: Y
authors.lastname: Punsawad
authors.forename: Yodchanan
authors.initials: Y
authors.lastname: Wongsawat
mesh_terms: D004569:Electroencephalography / Q000379:methods*; D005074:Evoked Potentials, Visual / Q000502:physiology*; D006801:Humans; D010363:Pattern Recognition, Automated / Q000379:methods*; D010775:Photic Stimulation / Q000379:methods*; D060388:Support Vector Machine; D014584:User-Computer Interface; D014793:Visual Cortex / Q000502:physiology*