Fig 7. Contribution of the 16 recorded electrodes to the decoding performance for Subject 4, right arm (in gray, Cz electrode).

The scalp maps are computed for each time lag (around 8.3 ms) and show parietal and strong central involvement. The relative contribution (%) for each lag is also computed showing a peak around 50 ms prior to the decoded instant corresponding to a 12.05% contribution. The remaining subjects show a similar behavior.