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: this model is built-in to neuron with suffix syn
COMMENT
an synaptic current with alpha function conductance defined by
i = g * (v - e) i(nanoamps), g(micromhos);
where
g = 0 for t < onset and
g = gmax * (t - onset)/tau * exp(-(t - onset - tau)/tau)
for t > onset
this has the property that the maximum value is gmax and occurs at
t = delay + tau.
ENDCOMMENT
NEURON {
POINT_PROCESS syn1
RANGE onset, tau, gmax, e, i
NONSPECIFIC_CURRENT i
}
UNITS {
(nA) = (nanoamp)
(mV) = (millivolt)
(umho) = (micromho)
}
PARAMETER {
onset=0 (ms)
tau=.1 (ms)
gmax=0 (umho)
e=0 (mV)
v (mV)
}
ASSIGNED { i (nA) g (umho)}
BREAKPOINT {
g = gmax * alpha( (t - onset)/tau )
i = g*(v - e)
}
FUNCTION alpha(x) {
if (x < 0 || x > 10) {
alpha = 0
}else{
alpha = x * exp(1 - x)
}
}
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