Scattered plots of the network interactions in the three epochs. Couplings which are statistically different from zero in the two (three) epochs are marked in blue (black). Others are marked in brow. The three couplings in the red circles, which are large and positive in the task (Maze) epoch, are potentiated in the SWS post task period with respect to the SWS pre task one. Connecting four neurons only, these couplings unveil the presence of a co-activated group of cells.