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Given that a certain amount of transmitter is released from the
synaptic terminal, we want to now model the current that appears in
the postsynaptic site. To do this we need to model *s*(*t*), the fraction
of open channels open due to the transmitter *T*. The typical way to
model these is via a series of reactions or so called Markov models in
which the probability of channels opening and closing is described by
a series of rate constants. This kind of detail is well beyond what
one wants for simple modeling, thus, instead, we will describe a
couple of simple models for the 4 primary types of postsynaptic
response induced by the two principle neurotransmitters.

*G. Bard Ermentrout*

*2/12/1998*