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Towards User-Friendly Spelling with an Auditory Brain-Computer Interface: The CharStreamer Paradigm

Figure 3

Design of the meta classifier which is optimized for sequential stimuli.

Plots A and B illustrate the EEG epochs and the stimulation sequence in condition C. Plot C shows the range of EEG epochs which were considered in order to compute the sequential classifier output with m = 9. Plot D depicts the processing pipeline of stimulus epochs: each epoch was evaluated by up to five classifiers and the resulting classifier outputs were considered as features of the sequential classifier. The sequential feature vector is evaluated by a meta classier which computes a sequential classifier output for the epoch of interest (E).

Figure 3