Identifying “resonance” frequencies for SSVEP-BCI.
Horki P, Neuper C, Müller-Putz G
A Brain-Computer Interface (BCI) is a device which transforms brain signals which are intentionally modulated by a user, into control commands. One type of BCI can be realized using steady-state visual evoked potentials (SSVEPs). We developed a screening procedure to select stimulus frequency yielding the best SSVEP response. To this end we designed an experiment where participants are presented an LED stimulus flickering at frequencies from 6 to 11 Hz in 0.5-Hz steps (random order). The SSVEP response is analyzed at the corresponding flicker frequency, as well at its second and third harmonic.