Towards User-Friendly Spelling with an Auditory Brain-Computer Interface: The CharStreamer Paradigm
Plot A–C describe the spelling accuracy obtained by the sequential classifier. The target sentence and the top-3 ranked characters of two users are shown in A. Histogram B depicts the rank of the target letter averaged across subjects. The individual rank-histograms are shown in C. Plot D depicts the spelling accuracy (rank = 1) of the standard classifier and the sequential classifier for each subject and the grand average (thick line). Plot E depicts the information transfer rate for each subject.