Figure 3. Manually choosing the artefact dimensions from tesa_sspsir visualisation. When choosing “Plots” for parameter 5, three figures are generated by tesa_sspsir. If control data is selected, then only the last figure (bottom panel, Figure 3) is shown. The first image shows the average time courses of different PCs (upper left panel, Figure 1), the second image shows the time frequency presentations of the PCs (upper right panel, Figure 2), and the last image (bottom panel, Figure 3) shows the magnitude of the high-frequency activity explained by different PCs. In this example, the three figures suggest two PCs (artefact dimensions) to be removed. The first two PC show strong sharp responses right after the TMS pulse; characterizing muscle artefacts. Similarly, these two biggest components show very broadband responses consisting of frequencies that are too high for neuronal EEG. The last figure shows that these two components explain most of the high-frequency signal, suggesting that by removing them, we remove the majority of the muscle-artefact data.- If chosen, you need to define the number of PCs to be removed in “number of PCs” (6).