Figure 5.

Bidirectional modulation of synchronous oscillations. The Poisson stimuli driving the network influence synchronous activity by modulating the oscillation frequency of the network in a nonmonotonic way. Full network activity is depicted for various stimulation intensities, and compared with the nonstimulated case. A, For μ = 0.15, the oscillation frequency is decreased throughout the network. A 10-fold increase in stimulus intensity (μ = 1.5) accelerates network oscillations, which are now faster than the nondriven case. Amplitudes, in contrast, monotonically increase with stimulus strength. B, Sample local activity (at unit i =N/2) as the stimulus intensity μ is smoothly changed from 0 to 0.5. One can appreciate the nonmonotonic aspect of the transitions. In each simulation, the initial conditions of the network are identical. The color encodes for the amplitudes.