Figure 2.

Persistent activity of the network in response to a transient input. The input is given by Equation (8). (A) The phase diagram of the network with varying STD strength β and inhibition strength k. The network can hold persistent activity of finite lifetimes over a range of parameter values around the boundary. The lifetime of persistent activity, T_life, is measured by the length of the decaying plateau. (B) The lifetime of persistent activity with the varying time scale of STD τ_d. β = 100. k = 0.12. The network holds persistent activity if the stimulation duration is long enough in the order of τ_f; otherwise the network response fades away rapidly as indicated by the black curve. Other parameters are: a = 0.5, J₀ = 0.5, f_min = 0.1, α = 20, m = 2.5τ/τ_v, η = 40, τ = 1 ms, τ_f = 10 ms, τ_v = 80 ms, τ_g = 3500 ms, A_amp = 0.15.