Fig 6. Detailed spiking LIF model confirms the results from analytic rate model.

Schematic of the LIF model with 2 sets of recurrently coupled E and I cells. There are 12 types of synaptic connections. (A) Pairwise correlations in PC, spontaneous vs. evoked: ${\rho }_{PC}^{Sp}>{\rho }_{PC}^{Ev}$. (B) Variability (Fano factor) in PC, spontaneous vs evoked: $F{F}_{PC}^{Sp}>F{F}_{PC}^{Ev}$. (C) Correlations in the spontaneous state, PC vs. OB: ${\rho }_{PC}^{Sp}>{\rho }_{OB}^{Sp}$. (D) Correlations in the evoked state, PC vs. OB: ${\rho }_{PC}^{Ev}<{\rho }_{OB}^{Ev}$. (E) Variability (Fano factor) in the spontaneous state, PC vs. OB: $F{F}_{PC}^{Sp}>F{F}_{OB}^{Sp}$. (F) Variability (Fano factor) in the evoked state, PC vs. OB: ${\text{Var}}_{PC}^{Ev}<{\text{Var}}_{OB}^{Ev}$ in evoked state. (G) Covariances in the evoked state, PC vs. OB: ${\text{Cov}}_{PC}^{Ev}<{\text{Cov}}_{OB}^{Ev}$. (H) Variability (spike count variance) in OB, spontaneous vs. evoked: ${\text{Var}}_{OB}^{Sp}<{\text{Var}}_{OB}^{Ev}$. The curves show the average statistics over all N_OB/PC cells or over a large random sample of all possible pairs. See Materials and methods for model details, and Table 4 and Eq 5 for parameter values.