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: Based on Im model of Vervaeke et al. (2006)
NEURON {
SUFFIX Im_v2
USEION k READ ek WRITE ik
RANGE gbar, g, ik
}
UNITS {
(S) = (siemens)
(mV) = (millivolt)
(mA) = (milliamp)
}
PARAMETER {
gbar = 0.00001 (S/cm2)
}
ASSIGNED {
v (mV)
ek (mV)
ik (mA/cm2)
g (S/cm2)
celsius (degC)
mInf
mTau
mAlpha
mBeta
}
STATE {
m
}
BREAKPOINT {
SOLVE states METHOD cnexp
g = gbar * m
ik = g * (v - ek)
}
DERIVATIVE states {
rates()
m' = (mInf - m) / mTau
}
INITIAL{
rates()
m = mInf
}
PROCEDURE rates() {
LOCAL qt
qt = 2.3^((celsius-30)/10)
mAlpha = 0.007 * exp( (6 * 0.4 * (v - (-48))) / 26.12 )
mBeta = 0.007 * exp( (-6 * (1 - 0.4) * (v - (-48))) / 26.12 )
mInf = mAlpha / (mAlpha + mBeta)
mTau = (15 + 1 / (mAlpha + mBeta)) / qt
}
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