izhikevich – Izhikevich neuron model¶
Description¶
Implementation of the simple spiking neuron model introduced by Izhikevich [1]. The dynamics are given by:
As published in [1], the numerics differs from the standard forward Euler technique in two ways:
the new value of \(U_m\) is calculated based on the new value of \(V_m\), rather than the previous value
the variable \(V_m\) is updated using a time step half the size of that used to update variable \(U_m\).
This model offers both forms of integration, they can be selected using the
boolean parameter consistent_integration
. To reproduce some results
published on the basis of this model, it is necessary to use the published form
of the dynamics. In this case, consistent_integration
must be set to false.
For all other purposes, it is recommended to use the standard technique for
forward Euler integration. In this case, consistent_integration
must be set
to true (default).
For a detailed analysis and discussion of the numerical issues in the original publication, see [2].
Parameters¶
The following parameters can be set in the status dictionary.
V_m |
mV |
Membrane potential |
U_m |
mV |
Membrane potential recovery variable |
V_th |
mV |
Spike threshold |
I_e |
pA |
Constant input current (R=1) |
V_min |
mV |
Absolute lower value for the membrane potential |
a |
real |
Describes time scale of recovery variable |
b |
real |
Sensitivity of recovery variable |
c |
mV |
After-spike reset value of V_m |
d |
mV |
After-spike reset value of U_m |
consistent_integration |
boolean |
Use standard integration technique |
References¶
Sends¶
SpikeEvent
Receives¶
SpikeEvent, CurrentEvent, DataLoggingRequest
See also¶
iaf_psc_delta, mat2_psc_exp