TITLE Calcium low threshold T type current version a for RD Traub 2005
COMMENT
This current is found in the model deepLTS cells
Traub made this model modifying Huguenard and Prince 1992 as
appeared on Destexhe et al 1996 (in vivo in vitro ...)
Modification by Tom Morse for Traub et al 2005
modified from
Implementation by Maciej Lazarewicz 2003 (mlazarew@seas.upenn.edu)
RD Traub, J Neurophysiol 89:909921, 2003
ENDCOMMENT
INDEPENDENT { t FROM 0 TO 1 WITH 1 (ms) }
UNITS {
(mV) = (millivolt)
(mA) = (milliamp)
}
NEURON {
SUFFIX cat_a
NONSPECIFIC_CURRENT i : not causing [Ca2+] influx
RANGE gbar, i, m, h, alphah, betah : m,h, alphah, betah for comparison with FORTRAN
}
PARAMETER {
gbar = 0.0 (mho/cm2)
v (mV)
}
ASSIGNED {
i (mA/cm2)
minf hinf (1)
mtau (ms) htau (ms)
alphah (/ms) betah (/ms)
}
STATE {
m h
}
BREAKPOINT {
SOLVE states METHOD cnexp
i = gbar * m * m * h * ( v  125 )
alphah = hinf/htau
betah = 1/htau  alphah
}
INITIAL {
settables(v)
: m = minf
h = hinf
m = 0
}
DERIVATIVE states {
settables(v)
m' = ( minf  m ) / mtau
h' = ( hinf  h ) / htau
}
UNITSOFF
PROCEDURE settables(v(mV)) {
TABLE minf, mtau,hinf, htau FROM 120 TO 40 WITH 641
minf = 1 / ( 1 + exp( ( v  52 ) / 7.4 ) )
mtau = 1 + .33 / ( exp( ( v + 27.0 ) / 10.0 ) + exp( (  v  102 ) / 15.0 ) )
hinf = 1 / ( 1 + exp( ( v + 80 ) / 5 ) )
htau = 28.30 +.33 / (exp(( v + 48.0)/ 4.0) + exp( ( v  407.0) / 50.0 ) )
}
UNITSON
