# Command: hh_psc_alpha

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Name:

    hh_psc_alpha - Hodgkin Huxley neuron model.

Description:

      hh_psc_alpha is an implementation of a spiking neuron using the Hodkin-Huxley
      formalism.

      (1) Post-syaptic currents
      Incoming spike events induce a post-synaptic change of current modelled
      by an alpha function. The alpha function is normalised such that an event of
      weight 1.0 results in a peak current of 1 pA.

      (2) Spike Detection
      Spike detection is done by a combined threshold-and-local-maximum search: if
      there is a local maximum above a certain threshold of the membrane potential,
      it is considered a spike.

Parameters:

      The following parameters can be set in the status dictionary.

      V_m	 double	- Membrane potential in mV
      E_L	 double	- Resting membrane potential in mV.
      g_L	 double	- Leak conductance in nS.
      C_m	 double	- Capacity of the membrane in pF.
      tau_ex	 double	- Rise time of the excitatory synaptic alpha function in ms.
      tau_in	 double	- Rise time of the inhibitory synaptic alpha function in ms.
      E_Na	 double	- Sodium reversal potential in mV.
      g_Na	 double	- Sodium peak conductance in nS.
      E_K	 double	- Potassium reversal potential in mV.
      g_K	 double	- Potassium peak conductance in nS.
      Act_m	 double	- Activation variable m
      Act_h	 double	- Activation variable h
      Inact_n   double	- Inactivation variable n
      I_e	 double	- Constant external input current in pA.

      Problems/Todo:

      better spike detection
      initial wavelet/spike at simulation onset

Require:

    HAVE_GSL

Receives:

    SpikeEvent, CurrentEvent, DataLoggingRequest

      Authors: Schrader

Sends:

    SpikeEvent

References:

      Spiking Neuron Models:
      Single Neurons, Populations, Plasticity
      Wulfram Gerstner, Werner Kistler,  Cambridge University Press

      Theoretical Neuroscience:
      Computational and Mathematical Modeling of Neural Systems
      Peter Dayan, L. F. Abbott, MIT Press (parameters taken from here)

      Hodgkin, A. L. and Huxley, A. F.,
      A Quantitative Description of Membrane Current
      and Its Application to Conduction and Excitation in Nerve,
      Journal of Physiology, 117, 500-544 (1952)

SeeAlso:

- hh_cond_exp_traub

Source:

    /opt/conda/conda-bld/nest_1510212701067/work/nest-2.14.0/models/hh_psc_alpha.h

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