Figure 4.

Influence of synaptic inhibition and adaptation on network-based oscillations. (A–D): Existence of oscillatory states (OSC) and corresponding frequencies f as a function of the strength g and timescale τ^ℐ_d of synaptic inhibition for networks with adaptation parameters and external input strengths as specified. Asynchronous states (ASYN) are indicated by white regions in the parameter space. Arrows mark balance of recurrent excitation and inhibition. On the left p^ℰ_d (green) and p^ℐ_d (orange) are shown for τ^ℐ_d = 1.5 ms, τ^ℐ_d = 5 ms. τ^ℐ_r was chosen such that the peaks of p^ℰ_d and p^ℐ_d occur at the same delay value. τ_w = 200 ms, τ^ℰ_r = 1.25 ms, and τ^ℰ_d = 1.5 ms. For other parameter values see the Methods section.