Figure 4.
Gap period analyses: time by amplitude plots show global field power over all sensors, indicating two significant voltage peaks (A); two-dimensional topographies reveal significant t values in warm colors for mid-gap (B) and late-gap (C) periods, with corresponding voltage topographies (B, C); event-related potential data from Pz sensor (indicated on heads) (D); express–regular source difference maps (F-distributed) on the MNI brain thresholded at >2 SDs above the mean voxel strength for each time period (E).