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:this model is built-in to neuron with suffix stim
COMMENT
Note:
$NEURONHOME/nrnoc/SRC/stim.mod shows the correct current stimulus model.
The model here does not work correctly if the "extracellular" mechanism is also
inserted at the same location because the NONSPECIFIC_CURRENT is
treated as a transmembrane current.
For electrodes, there is a special ELECTRODE_CURRENT directive in
the NEURON block that should be used. Also a positive ELECTRODE_CURRENT
is equivalent to an inward membrane current so the assignment to i has
a different sign.
ENDCOMMENT
NEURON {
POINT_PROCESS stim1
RANGE del, dur, amp, i
NONSPECIFIC_CURRENT i
}
UNITS {
(nA) = (nanoamp)
}
PARAMETER {
del (ms)
dur (ms)
amp (nA)
}
ASSIGNED { i (nA) }
BREAKPOINT {
if (t < del + dur && t > del) {
i = -amp
}else{
i = 0
}
}
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