Before revision:  After EEG signal acquisition, a closed-loop EEG-based BCI system also includes signal processing, feature engineering, and classification /regression blocks before sending out the control signal  , whereas previous approaches only considered TL in one or two such components.
After revision:  After EEG signal acquisition, a closed-loop EEG-based BCI system also includes signal processing, feature engineering, and classification /regression blocks before sending out the control signal to an external device , whereas previous approaches only considered TL in one or two such components.