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. 2018 Mar 29;8(4):57. doi: 10.3390/brainsci8040057

Figure 4.

Figure 4

Chroma Speller in its two operating stages [74]. (a) The first-stage selection. (b) The second stage to select an individual character. The target word here was suggested to be “BCI”, and “B” is the target letter. Figures modified from [74].