Fig 3. BCI architecture.

Signal processing and information flow during calibration (top row) and online application (bottom row) of the system. Note, the dual use of the automatic music generation system in both cases for providing either open-loop stimulation (calibration) or closed-loop feedback (application). The black dashed lines indicate model-specific parameters (filter parameters, standardization and baseline parameters, and classifier parameters) that were obtained during calibration, and utilized during online application.