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Comparison of Sensor Selection Mechanisms for an ERP-Based Brain-Computer Interface

Figure 1

Labyrinth Oddball: The subject plays a physical simulation of a ball labyrinth game.

He has to respond to rare target stimuli by pressing a buzzer and ignore the more frequent standard stimuli. The insets show the shape of the stimuli, which can be distinguished by the length of the edges. The graphs to the left depict the event-related potentials (ERPs) evoked by both stimulus types at electrode Pz. Both stimuli elicit an early negative potential attributed to visual processing, but only targets evoke an additional strong, positive potential around 600 after the stimulus.

Figure 1