Figure 4.

Electrophysiological results. A, The topographies show the clusters of electrodes whose activity differed from baseline, regardless of the conditions; the left and right plots show the first and second time windows, respectively. Red/black dots represent electrodes included/excluded in/from the cluster. B, Grand average of ERP traces elicited by rare (red) and frequent (blue) transitions in the first (left plot), and second cluster (right plot). The subplot shows the mean difference ± SE between rare and frequent condition in the respective time windows. Dots represent subjects. C, Topography of the difference rare-frequent in the second clusters of electrodes. The effect involves mostly central regions. D, Scatter plots of ERP and pupil differences (rare − frequent) in the second cluster.