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Response of the FN model to high-rate stimulation. Parametric or “phase-plane” plot of the excitation (x) and refractory (y) variables of the FN model. As a guide to the eye, horizontal line segments are drawn to connect the discontinuous segments of the solution. These discontinuities are due to the stimulus pulses. The stimulus rate is 5 kHz and the stimulus level is 1.13278 times threshold (Aθ = 0.602349).
