title: Simultaneous detection of P300 and steady-state visually evoked potentials for hybrid brain-computer interface.
abstract: OBJECTIVE
  We study the feasibility of a hybrid Brain-Computer Interface (BCI) combining simultaneous visual oddball and Steady-State Visually Evoked Potential (SSVEP) paradigms, where both types of stimuli are superimposed on a computer screen. Potentially, such a combination could result in a system being able to operate faster than a purely P300-based BCI and encode more targets than a purely SSVEP-based BCI.
  
  
  METHODS
  We analyse the interactions between the brain responses of the two paradigms, and assess the possibility to detect simultaneously the brain activity evoked by both paradigms, in a series of 3 experiments where EEG data are analysed offline.
  
  
  RESULTS
  Despite differences in the shape of the P300 response between pure oddball and hybrid condition, we observe that the classification accuracy of this P300 response is not affected by the SSVEP stimulation. We do not observe either any effect of the oddball stimulation on the power of the SSVEP response in the frequency of stimulation. Finally results from the last experiment show the possibility of detecting both types of brain responses simultaneously and suggest not only the feasibility of such hybrid BCI but also a gain over pure oddball- and pure SSVEP-based BCIs in terms of communication rate.
authors: Laboratoriumvoor Neuro- en Psychofysiologie, KU Leuven, Leuven, Belgium.
authors: Adrien
authors: A
authors: Combaz
authors: Laboratoriumvoor Neuro- en Psychofysiologie, KU Leuven, Leuven, Belgium.
authors: Marc M
authors: MM
authors: Van Hulle
mesh_terms: D000465:Algorithms; D001921:Brain / Q000502:physiology*; D062207:Brain-Computer Interfaces; D018913:Event-Related Potentials, P300; D005074:Evoked Potentials, Visual; D005240:Feasibility Studies; D006801:Humans; D012815:Signal Processing, Computer-Assisted