Figure 3.3.

Fast/slow treatment of model (3.3) for episodic activity in developing chick spinal cord. A: Bifurcation diagram of the a – d subsystem with s as a parameter. There is an S-shaped curve of the steady states (solid, stable; dashed, unstable), periodic orbits are shown with minimal and maximal a values (thick curve). Bursting solution of the full system is overlayed on top. B: Time courses of a and s of the same solution as in A. Time is in arbitrary units here; activity, a(t), is relative to a maximum. (Adapted from [4, fig. 22] with permission from Elsevier; see also [60]).