"Spiking and bursting patterns of neurons are characterized by a high degree of variability.
A single neuron can demonstrate endogenously various bursting patterns, changing in response to external disturbances
due to synapses, or to intrinsic factors such as channel noise.
We argue that in a model of the leech heart interneuron existing variations of bursting patterns are
significantly enhanced by a small noise.
In the absence of noise this model shows periodic bursting with fixed
numbers of interspikes for most parameter values. ..."
Channell P, Fuwape I, Neiman AB, Shilnikov AL (2009) Variability of bursting patterns in a neuron model in the presence of noise. J Comput Neurosci 27:527-42 [PubMed]