**Name:**

hh_psc_alpha - Hodgkin-Huxley neuron model.

**Description:**

hh_psc_alpha is an implementation of a spiking neuron using the Hodgkin-Huxley

formalism.

(1) Post-synaptic 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:**

**Source:**

/home/graber/work-nest/nest-git/nest-simulator/models/hh_psc_alpha.h