ObjectiveWe study the feasibility of a hybrid Brain-Computer Interface (BCI) combining simultaneousvisual oddball and Steady-State Visually Evoked Potential (SSVEP) paradigms, where bothtypes of stimuli are superimposed on a computer screen. Potentially, such a combinationcould result in a system being able to operate faster than a purely P300-based BCI and encodemore targets than a purely SSVEP-based BCI.ApproachWe analyse the interactions between the brain responses of the two paradigms, and assessthe possibility to detect simultaneously the brain activity evoked by both paradigms, in a seriesof 3 experiments where EEG data are analysed offline.Main ResultsDespite differences in the shape of the P300 response between pure oddball and hybridcondition, we observe that the classification accuracy of this P300 response is not affectedby the SSVEP stimulation. We do not observe either any effect of the oddball stimulation onthe power of the SSVEP response in the frequency of stimulation. Finally results from thelast experiment show the possibility of detecting both types of brain responses simultaneouslyand suggest not only the feasibility of such hybrid BCI but also a gain over pureoddball- and pure SSVEP-based BCIs in terms of communication rate.
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