Fig. 4: Dynamics of a single QIF neuron.
From: Neurophysiological avenues to better conceptualizing adaptive cognition
(a1) shows the excitable case with V(0) <√|η | , (a2) with V(0)>√|η| and (a3) corresponds to tonic firing. The solid and dashed black lines mark V = ∓ √|η| and spike times are denoted by t1, t2, and t3. (b) Bifurcation diagram V versus η. The solid and dashed black lines show the stable and unstable fixed points of Eq. (2.2). The saddle-node bifurcation at (V = 0, η = 0) is marked by a black dot; the SNIC bifurcation at η = 0 by a green line. The orange region marks η ≥ 0, for which stable limit cycles exist.
