Optogenetic Stimulation Shifts the Excitability of Cerebral Cortex from Type I to Type II: Oscillation Onset and Wave Propagation
Fig 4
Type I excitability in an isolated pair of excitatory-inhibitory populations.
All parameters were the same as for type II excitability except that the threshold of inhibition was increased from bi = 4 to bi = 8. A: Return trajectories in the phase plane. B: Time plots of the return trajectories. C: Bifurcation diagram of Ue versus Je. The critical point of the SNIC bifurcation marks the abrupt onset of large-amplitude oscillations in Ue.