Figure 7.
Simulation of null model: amplitude-modulated autocoherent oscillator from LFP data. A, Power of stimulated LFP data at frequencies significantly elevated from the spontaneous activity (green); power spectrum of the simulated amplitude-modulated ACO is a symmetric power spectrum fitted to the LFP data (black). B, Phase spectrum of simulated amplitude-modulated ACO. C, Simulated amplitude-modulated ACO signal, A(t), generated by the inverse Fourier transform of the spectra in A (black) and B. D, Power spectra of spontaneous activity of LFP data (black), stimulated LFP data (blue), and simulated null model: simulated amplitude-modulated ACO added to simulated spontaneous activity (green). E, Voltage time series of LFP data. F, Voltage time series of simulated null model: simulated amplitude-modulated ACO added to simulated spontaneous activity. G, Spectrogram of E. H, Spectrogram of F. I, Phase portrait of LFP data (subplot E) at the estimated carrier frequency. J, Phase portrait of simulated null model (subplot F) at the estimated carrier frequency.