The Generation and Modulation of Distinct Gamma Oscillations with Local, Horizontal, and Feedback Connections in the Primary Visual Cortex: A Model Study on Large-Scale Networks

Figure 4

Modulation of gamma oscillations in HC network with FB. (a) shows the power spectrum of the LFPs from two example networks (solid red curve is the power spectrum from the network with FB, and the dashed red curve is from the network without FB). (b–g) are similar to Figures 3(c)–3(h). The powers of slow and fast gamma for different FB connection strength are shown in (b) and (c), respectively. (d) shows how peak power changes with connection weight at two values (similar to color plots (b) and (c)). The black line denotes the case of slow gamma (dashed black line for , and solid black line for ), and grey line is for that of fast gamma (dashed grey line for , and solid grey line for ). The peak frequency of slow and fast gamma for different connection strength is shown in (e) and (f), respectively. (g) shows how peak frequency changes of connection weight corresponding to the color plot in (c) and (d). The black line denotes the case of slow gamma (dashed black line for , and solid black line for ), and grey line is for that of fast gamma (dashed grey line for , and solid grey line for ).

(a)

(b)

(c)

(d)

(e)

(f)

(g)