TITLE Sodium transient current for Schmidt-Hieber et al. 2008, kinetics from Engel & Jonas, 2005.
COMMENT
Implemented by Erin Munro
ENDCOMMENT
INDEPENDENT { t FROM 0 TO 1 WITH 1 (ms) }
UNITS {
(mV) = (millivolt)
(mA) = (milliamp)
}
NEURON {
SUFFIX nafJonas
USEION na READ ena WRITE ina
RANGE gbar, ina, m, h, df, am, bm, ah, bh
}
PARAMETER {
gbar = 0.0 (mho/cm2)
v (mV) ena (mV)
}
ASSIGNED {
ina (mA/cm2)
am (1/ms) bm (1/ms)
ah (1/ms) bh (1/ms)
df (mV)
}
STATE {
m h
}
BREAKPOINT {
SOLVE states METHOD cnexp
ina = gbar * m * m * m * h * ( v - ena )
df = v - ena
}
INITIAL {
settables( v )
m = 0
h = ah/(ah+bh)
}
DERIVATIVE states {
settables( v )
m' = am*( 1 - m ) - bm*m
h' = ah*( 1 - h ) - bh*h
}
UNITSOFF
PROCEDURE settables(v(mV)) {
TABLE am, bm, ah, bh FROM -120 TO 40 WITH 641
am = -93.8*(v - 117) / (exp( -(v - 117 ) / 17.7 ) - 1 )
bm = 0.168*exp(-(v-12)/23.3)
ah = 0.000354*exp(-(v-12)/18.7)
bh = 6.63/(exp(-(v+5.68)/13.3)+1)
}
UNITSON