Figure 6.
Dependence of frequency and damping on background state for the damped oscillations. System connection weights are fixed as (wEI, wIE, wII, wEE) = (50,15,0, 15). Input is a step function of magnitude 0.1. We have verified that the curves are the same for step functions up to 0.3 Frequency was estimated by analyzing zero crossings. Damping was estimated by fitting an exponential decay to the peaks of a rectified (absolute value) of the time series. Normalized frequency is fτE. If τE = 20 ms, normalized frequency of 1 corresponds to a 50 Hz oscillation. (A) Normalized frequency (B) Damping coefficient.