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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: J Neural Eng. 2011 Nov 4;8(6):065003. doi: 10.1088/1741-2560/8/6/065003

Figure 5.

Figure 5

Frame by frame depiction of the escape mechanism for the model without feedback. In the top boxes RG - F and RG - E positions are plotted at various timepoints with their relevant nullclines in (VRG, hNaPRG) space. The corresponding voltages of In - F and In - E are tracked in the lower boxes. For all neurons and V -nullclines, red indicates flexor and blue indicates extensor, the h-nullcline is shown in green, and the voltage threshold is indicated in magenta. (A) Inhibition from In - F decreases over time, lowering RG - E’s V -nullcline until the left knee can be reached. (B) RG - E hits the knee and jumps across threshold. (C) Excitation from RG - E pushes In - E across threshold. In - E begins inhibiting RG - F which raises its V -nullcline, causing RG - F to jump below threshold. This decreases excitation to In - F, which also begins to fall below threshold. (D) RG - F and RG - E have switched dominance, as have In - F and In - E.