Fig. 1From: Comparison of eye tracking, electrooculography and an auditory brain-computer interface for binary communication: a case study with a participant in the locked-in stateSchematic figure depicting the position of the eye tracker in front of the user. Lateral view (a) and rear view (b). The user’s fixation point could be determined in the area above the eye tracker. The fixation point was determined as being either in the left or right half of this area and thus, the user could make a binary choiceBack to article page