Figure 5

VEPs obtained from gradient-artifact corrected (Orig) and also BCG-artifact corrected (AAS, ICA, OBS and aOBS) data in a representative subject (S1). These VEP were compared with those obtained from the same subject outside the scanner (Out). EEG signals were epoched using the visual events as triggers, and baseline-corrected using the pre-stimulus interval. (a) Average time-courses for all recording EEG channels are presented on the left (Butterfly plot); (b) Topographic maps, on the right (Topography), refer to the spatial distribution across channels at the P100 latency, which commonly corresponds to the strongest visual activation.