Figure 2. Suppression of low-frequency fluctuations in recurrent LIF networks
with purely inhibitory (A, C) and mixed excitatory-inhibitory coupling
(B, D) for instantaneous synapses with delay 
(A, B) and
low-pass synapses with 
(C, D).
Power-spectra 
of
population rates 
for the
feedback (black) and the feedforward case (gray; cf. Fig. 1). See Table 1 and Table 2 for details
on network models and parameters. In C and D, local synaptic inputs are
modeled as currents 
with 
-function shaped kernel 
with time
constant 
(
denotes
Heaviside function). (Excitatory) Synaptic weights are set to
(see Table 1 for
details). Simulation time 
. Single-trial spectra smoothed by moving average
(frame size 
).