title: SSVEP-based brain-computer interfaces using FSK-modulated visual stimuli.
abstract: A brain-computer interface (BCI) based on steady-state visual-evoked potentials (SSVEP) has two difficulties: limitation of the number of commands and uneven probabilities of command execution. To address these problems, the present paper proposes a paradigm of BCI using frequency-modulated visual stimuli. The commands are translated into code words consisting of binary digits, to which visual stimuli with distinct frequencies are assigned. Frequencies of SSVEP are recognized to detect bits, and a command to be executed is determined from the sequence of detected bits. Experimental results show that the proposed paradigm achieves a reliable BCI with higher accuracies and balanced command executing probabilities.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Kimura
authors.forename: Toshihisa
authors.initials: T
authors.lastname: Tanaka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Higashi
authors.forename: Naoki
authors.initials: N
authors.lastname: Morikawa
mesh_terms: D000328:Adult; D000465:Algorithms; D062207:Brain-Computer Interfaces; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation / Q000379:methods*; D012815:Signal Processing, Computer-Assisted; D014793:Visual Cortex / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult