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

Figure 3.

Figure 3

Graphical User Interface (GUI) of a modern P300 speller: (a) Matrix Speller inspired by the matrix developed by Farwell and Donchin in 1988 [7], shown during the intensification of the third row. (b) The random intensification similar to the one discussed in Yeom et al., 2014 [43]. (c) A view of the Edge Paradigm from Obeidat et al., 2015 [44] showing the intensification of the edge point next to the third row. All the above figures show “BCI” as the target word during spelling and “B” as an already selected character. Figures modified from the cited sources.