Figure 4. .

Group of neural cells supporting effectively potentiated couplings in session A. (A) Effective potentiation Pot after removal of one cell (index along the x-axis) from the spiking data of session A. For most cells the removal has no significative impact. A substantial decrease is observed for a few cells, indicated with their indices. (B) Left: main pairwise contributions Pot_ij to the effective potentiation (Methods). Right: Networks of couplings supported by the seven-cell group identified in panel A, in the three epochs of session A. Line thickness is proportional to Pot_ij (left panel) and J_ij (right panels). (C) Left: Scatter plot of the differences between the couplings in the Sleep epochs, $\Delta J_{ij}=J_{ij}^{Post}-J_{ij}^{Pre}$, vs. their values in Task, $J_{ij}^{Task}$. Right: same as left panel for the correlation indices CI_ij; see text for definition. A group of seven neurons supports most of the couplings that are large and positive in Task and in Sleep Post, but not in Sleep Pre; red circles identify the 21 couplings between those seven neurons.