TITLE Continuous synaptic tanh-type transmission mechanism
COMMENT
This mechanism is the same as tanhsyn, but the synaptic transmission delay
can be specified via the integration loop, i.e., proc advance(), in the main hoc
file. Specifically, a vector records the membrane voltage traces of the
presynaptic neurons, and the membrane voltage at a certain previous time
point can be assigned to vpre in this mechanism.
ENDCOMMENT
NEURON {
POINT_PROCESS tanhSyn2
RANGE tau, e, i, noise, alpha, s, g, rparam, voff, vpre
NONSPECIFIC_CURRENT i
}
UNITS {
(uS) = (microsiemens)
(mS) = (millisiemens)
(mV) = (millivolt)
(mA) = (milliamp)
}
PARAMETER {
e = 0 (mV)
alpha = 0.55
tau = 5.26 (ms) <1e-9,1e9>
noise = 0
g = 2.7e-4 (uS)
rparam = 4
voff = 0 (mV)
vpre = -60 (mV)
}
ASSIGNED {
v (mV)
i (nA)
}
STATE {
s
}
INITIAL {
s=0
}
BREAKPOINT {
SOLVE state METHOD cnexp
i = g*s*(v - e)
}
DERIVATIVE state {
s' = alpha*(1+tanh(vpre-voff/rparam))*(1-s) - s/tau + noise
}