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67 lines
956 B
67 lines
956 B
: HH Low TEA-sensitive Purkinje potassium current |
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: Created 8/7/02 - nwg |
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NEURON { |
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THREADSAFE |
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SUFFIX kpkj2 |
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USEION k READ ek WRITE ik |
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RANGE gbar, ik, gk |
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GLOBAL ninf, ntau |
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} |
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UNITS { |
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(mV) = (millivolt) |
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(mA) = (milliamp) |
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} |
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PARAMETER { |
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v (mV) |
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gbar = .002 (mho/cm2) |
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nivh = -24 (mV) |
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nik = 20.4 (mV) |
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ek (mV) |
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} |
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ASSIGNED { |
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gk (mho/cm2) |
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ik (mA/cm2) |
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ninf (1) |
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ntau (ms) |
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} |
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STATE { |
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n |
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} |
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INITIAL { |
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rates(v) |
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n = ninf |
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} |
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BREAKPOINT { |
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SOLVE states METHOD cnexp |
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gk = gbar * n^4 |
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ik = gk * (v - ek) |
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} |
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DERIVATIVE states { |
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rates(v) |
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n' = (ninf - n) / ntau |
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} |
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PROCEDURE rates(Vm (mV)) { |
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LOCAL v |
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v = Vm + 11 : Account for Junction Potential |
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ninf = 1/(1+exp(-(v-nivh)/nik)) |
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ntau = 1000 * ntau_func(v) |
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} |
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FUNCTION ntau_func(v (mV)) (ms) { |
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if (v < -20) { |
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ntau_func = 0.000688 (ms) + 1 (ms)/(exp((v+64.2 (mV))/6.5 (mV))+exp((v-141.5 (mV))/-34.8 (mV))) |
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} else { |
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ntau_func = 0.00016 (ms) + 0.0008 (ms) *exp(-0.0267 * v /(1 (mV))) |
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} |
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}
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