Description
The FitzHugh-Nagumo system describes a prototype of an excitable system (e.g., a neuron).
If the external stimulus 
exceeds a certain threshold value, the system will exhibit a characteristic excursion in phase space, before the variables 
and 
relax back to their rest values. This behaviour is typical for spike generations (=short elevation of membrane voltage ) in a neuron after stimulation by an external input current.
References
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