Figure 5.

Effects of adaptation timescale on network-based oscillations. (A) Top: Spike rate r_ℰ as a function of the adaptation time constant τ_w for networks with dominant recurrent excitation (g = 1.05, violet) and inhibition (g = 1.5, blue). Dashed lines indicate maxima and minima of oscillating r_ℰ, solid lines represent constant r_ℰ. Bottom: Corresponding oscillation frequencies f. a = 5 nS and b = 0.05 nA. r^ℰ_ext = 7.5 Hz, τ^ℰ_r = 1.25 ms, τ^ℰ_d = 1.55 ms, τ^ℐ_r = 0.98 ms, and τ^ℐ_d = 2 ms. Other parameters as in Figure 4. (B): Raster plots of simulated networks of size N = 50,000 with g = 1.5 and τ_w = 100 ms (top) as well as τ_w = 400 ms (bottom), showing the spike times of 200 excitatory and 50 inhibitory aEIF neurons. Other parameter values as in (A).