gh.mod

TITLE gh channel for motoneurons
COMMENT
	Hodgkin - Huxley h channel

	Model Reference: 
  
	Powers, R.K. and Heckman, C.J., 2017. 
	"Synaptic control of the shape of the motoneuron 
	pool input-output function." 
	Journal of neurophysiology, 117(3), pp.1171-1184.
  
    Original Code Link:
      https://senselab.med.yale.edu/ModelDB/showmodel?model=239582

ENDCOMMENT

NEURON {
	SUFFIX gh
	NONSPECIFIC_CURRENT i
	RANGE i, eh, ghbar, half, slp
	RANGE htau
}

UNITS {
	(mA) = (milliamp)
	(mV) = (millivolt)
}

PARAMETER {
	v (mV)
	ghbar =.001 (mho/cm2) <0,1e9>
	htau = 50 (ms)
	half=-80 (mV)
	slp=8 (mV)
	eh = -41 (mV)
}

STATE {n}

ASSIGNED {
	i (mA/cm2)
	inf
}

INITIAL {
	rate(v)
	n = inf
}

BREAKPOINT {
	SOLVE states METHOD cnexp
	i=ghbar*n*(v - eh)
}

DERIVATIVE states {	
	rate(v)
	n' = (inf - n)/htau
}
UNITSOFF

PROCEDURE rate(v(mV)) {	
	TABLE inf DEPEND half,slp FROM -100 TO 100 WITH 200
		inf = 1/(1+exp((v-half)/slp))
}
UNITSON