Figure 5.

Illustration of the online evaluation/offline cross validation scheme (see also Section 5.3). In the preliminary offline study, three runs of data were recorded in total. The runs of the data were used as splits for the cross validation as follows. All combinations of runs in a session were used, resulting in three different training/evaluation combinations. Two recorded runs were used for training of the data dependent methods and the remaining run was used for the offline evaluation. In each run the data was recorded using the Magma-Box-Setup, i.e., it consisted of $4\times 32=128$ channels of EEG data and 8 channels of EMG data. Due to the restrictions of the recording hardware discussed in the text, a modified recording scheme was used for the offline evaluation. Online evaluation: In this case, the two initial training sets were recorded using the Magma-Box-Setup. In the test/evaluation phase, a single run was recorded using the USB-Box-Setup. The physiological data was processed in real-time and the results recorded for subsequent analysis.