Fig. 6.

Diffusion on a limit cycle. (A) The mean-field model as shown in Fig. 4C (u = 5.065 mA; γ₃₁^E = 0.5), exhibits low frequency, theta limit-cycle oscillations (dashed line). Adding state noise to the system by increasing the diffusion coefficient causes the orbit to speed up at V_pyram ~ -40 mV, while decreasing the strength of the diffusion coefficient slow it down. (B) Phase domain plots showing greater symmetry (resp. asymmetry) in the orbit at D = 150% (resp. 50%) baseline. (C) Frequency spectra show a higher peak frequency for D = 150%.