OhmicHH

class braincell.channel.OhmicHH(size, name=None)

HH gating driven by an ohmic current, \(g \cdot \prod g_i^{p_i} \cdot (E - V)\).

Most voltage-gated channels in the catalogue share exactly this current expression, so HH covers only the gating and this subclass adds the driving force. Channels whose current is a constant-field flux use GhkHH instead; anything else inherits HH directly and implements current() itself.

The maximal conductance is read from self.g_max. A channel that names it differently, or that scales the driving force some other way, overrides current().

See also

HH

Gating-only template, for channels with a non-ohmic current.

GhkHH

Sibling template for constant-field (GHK) calcium currents.

OhmicMarkov

The same driving force over Markov probability states.

Examples

>>> import brainunit as u
>>> from braincell.channel import Gate, OhmicHH
>>> from braincell.ion import Sodium
>>> class MyNa(OhmicHH):
...     root_type = Sodium
...     gates = (Gate("m", power=3), Gate("h"))
...     def __init__(self, size, g_max=10.0 * (u.mS / u.cm**2)):
...         super().__init__(size=size)
...         self.g_max = g_max
...     def f_m_inf(self, V, Na):
...         return 0.6
...     def f_m_tau(self, V, Na):
...         return 0.4
...     def f_h_inf(self, V, Na):
...         return 0.3
...     def f_h_tau(self, V, Na):
...         return 2.0

The gates supply m ** 3 * h and OhmicHH supplies g_max * m ** 3 * h * (E - V), so no current method is needed.