Fig. 1.

(a) Simulation architecture and parameters. The two grey circles represent the two areas in this model, while S1 and S2 denote two frequency modes within each area. A frequency mode corresponds to a pattern of frequency-specific deviations from the baseline spectral profile (these patterns are shown as a function of frequency in the inserts). Time-dependent modulations of these frequency modes correspond to evoked and induced responses. The solid lines represent nonlinear connections because they connect different frequency modes, while the dashed lines couple the same frequency modes and therefore model linear coupling. The red lines indicate the connections that can change in a condition-specific fashion (here, whether we are trying to explain induced or purely evoked spectral responses). (b) The time-frequency data generated by this model. These are linear mixtures of the two time-varying frequency modes above. Left column: Area 1; right column: Area 2.