Anna Chabuda|Piotr Durka|Jaros?aw ?ygierewicz
High Frequency SSVEP-BCI With Hardware Stimuli Control and Phase-Synchronized Comb Filter
University of Warsaw|University of Warsaw|University of Warsaw
present efficient implementation braincomputer interface bci based highfrequency steady state visually evoked potentials ssvep individual shape ssvep response extracted means feedforward comb filter adds delayed versions signal rendering stimuli controlled specialized hardware bci appliance 15 participants study nine able produce stable response least eight ten frequencies 3039 hz range achieved average 964 accuracy 475 bitmin information transfer rate itr optimized simple sevenletter speller generic fullalphabet speller allowed group 899 accuracy 369 bitmin itr values exceed performances highfrequency ssvepbci systems reported date classical approach ssvep parameterization relative spectral power frequencies stimulation implemented data resulted significantly lower performance suggests specific shape response important feature classification finally discuss differences ssvep responses participants able unable use interface well statistically significant influence layout speller speed bci operation