Fig. 1From: The challenge of controlling an auditory BCI in the case of severe motor disabilityAuditory brain-computer interface protocol for healthy subjects (SOA = 250 ms). One block comprised 30 standards sounds and 6 deviants of each category (“Yes” or “No”), i.e. 72 stimuli. The deviant sounds happen randomly. It took 18 s to obtain an answerBack to article page