hh_psc_alpha – Hodgkin-Huxley neuron model
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Description
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``hh_psc_alpha`` is an implementation of a spiking neuron using the Hodgkin-Huxley
formalism.

1. Postsynaptic currents
Incoming spike events induce a postsynaptic change of current modelled
by an alpha function. The alpha function is normalized 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.

See also [1]_, [2]_, [3]_.

Parameters
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The following parameters can be set in the status dictionary.

========  ======  ============================================================
V_m       mV      Membrane potential
E_L       mV      Leak reversal potential
C_m       pF      Capacity of the membrane
g_L       nS      Leak conductance
tau_ex    ms      Rise time of the excitatory synaptic alpha function
tau_in    ms      Rise time of the inhibitory synaptic alpha function
E_Na      mV      Sodium reversal potential
g_Na      nS      Sodium peak conductance
E_K       mV      Potassium reversal potential
g_K       nS      Potassium peak conductance
Act_m     real    Activation variable m
Inact_h   real    Inactivation variable h
Act_n     real    Activation variable n
I_e       pA      External input current
========  ======  ============================================================

Problems/Todo
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- better spike detection
- initial wavelet/spike at simulation onset

References
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.. [1] Gerstner W, Kistler W (2002). Spiking neuron models: Single neurons,
       populations, plasticity. New York: Cambridge University Press
.. [2] Dayan P, Abbott LF (2001). Theoretical neuroscience: Computational and
       mathematical modeling of neural systems. Cambridge, MA: MIT Press.
       https://pure.mpg.de/pubman/faces/ViewItemOverviewPage.jsp?itemId=item_3006127>
.. [3] Hodgkin AL and Huxley A F (1952). A quantitative description of
       membrane current and its application to conduction and excitation in
       nerve. The Journal of Physiology 117.
       DOI: https://doi.org/10.1113/jphysiol.1952.sp004764

Sends
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SpikeEvent

Receives
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SpikeEvent, CurrentEvent, DataLoggingRequest

See also
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:doc:`Neuron <index_neuron>`, :doc:`Hodgkin-Huxley <index_Hodgkin-Huxley>`, :doc:`Current-Based <index_current-based>`