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