Network mechanisms underlying the role of oscillations in cognitive tasks
Fig 7
A Here we illustrate the interplay between high frequency forcing and a transient stimulus outside the bistable regime. In the absence of oscillations, a 40ms long stimulus with amplitude 6.8 (bar) does not produce sustained activity in the model system, neither do oscillations on their own. However, the combination of oscillations with the transient stimulus leads to sustained high activity, until the oscillations are turned off (arrow). B Loci of the saddle-node bifurcation representing the lower limit of the bistable area, as functions of η and the frequency of the forcing, for different amplitudes of forcing. The choice of parameters in A is indicated by a triangle. Parameters: η = −11.5, Δ = 2, , τ = 20ms, A = 2, f = 80Hz.