The FitzHugh–Nagumo model (FHN) describes a prototype of an excitable system (e.g., a neuron). It is an example of a relaxation oscillator because, if the external stimulus I ext {\displaystyle I_{\text{ext}}} exceeds a certain threshold value, the system will exhibit a characteristic excursion in phase space, before the variables v {\displaystyle v} and w {\displaystyle w} relax back to their rest values.
The FitzHugh–Nagumo model (FHN) describes a prototype of an excitable system (e.g., a neuron). It is an example of a relaxation oscillator because, if the external stimulus I ext {\displaystyle I_{\text{ext}}} exceeds a certain threshold value, the system will exhibit a characteristic excursion in phase space, before the variables v {\displaystyle v} and w {\displaystyle w} relax back to their rest values.
Source: Wikipedia "FitzHugh–Nagumo model" · CC BY-SA 4.0
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