True Zero-Training Brain-Computer Interfacing – An Online Study
Figure 5
Spelling results for subject nbf during the unsupervised blocks.
Per block, the top line represents the desired text, the middle line displays text produced online by the unsupervised classification. Text predicted by the posthoc re-analysis at the end of the block is shown at the bottom line. Two trials are needed to determine a symbol. Individual selection errors (wrong trials) of both methods are marked by black squares directly below each symbol. Please note that the classifier was re-initialized randomly at the beginning of each block.