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. 2013 Sep 17;7:568. doi: 10.3389/fnhum.2013.00568

Figure 2.

Figure 2

Example of the display of a classic BCI training protocol. Left: An arrow pointing left indicates the learner to imagine a left hand movement. Right: A feedback bar is provided to the learner. The direction and length of this bar indicate the classifier output and thus the recognized mental task. Indeed, the bar extends toward the left for an identified imagined left hand movement, and toward the right for an identified imagined right hand movement.