Izhi_Neuron Class Reference
#include <izhi_neuron.h>
Inheritance diagram for Izhi_Neuron:
List of all members.
Detailed Description
A canonical bursting and spiking neuron.
see Izhikevich E. "Simple model of Spiking Neurons"
Model
A canonical neuron model is implemented where the membrane potential
of a neuron is given by
,
is the membrane resistance,
is the current supplied by the synapses,
is a non-specific background current and
is a Gaussion random variable with zero mean and a given variance noise.
At time
ist set to
. If
exceeds the threshold voltage
it is reset to
and hold there for the length
of the absolute refractory period.
Implementation
The simple Euler method is used for numerical integration.
Public Member Functions
-
virtual int updateInternal (void)
- Recalculate exp. Euler constants.
-
virtual void reset (void)
- Reset the leaky I&F neuron.
-
virtual double nextstate (void)
- Calculate the new membrane voltage and check wheter Vm exceeds the threshold V_thresh.
-
virtual int isRefractory (void)
- Returns 1 (0) if the neuron is (not) in its absolute refractory period.
Public Attributes
-
float Cm
- The membrane capacity
[range=(0,1); units=F;].
-
float Rm
- The membrane resistance
[units=Ohm; range=(0,1e30)].
-
float Vthresh
- If
exceeds
a spike is emmited. [units=V; range=(-10,100);].
-
float Vresting
- The resting membrane voltage. [units=V; range=(-1,1);].
-
float Vreset
- The voltage to reset
to after a spike. [units=V; range=(-1,1);].
-
float Vinit
- The initial condition for
at time
. [units=V; range=(-1,1);].
-
float Trefract
- The length of the absolute refractory period. [units=sec; range=(0,1);].
-
float Inoise
- The standard deviation of the noise to be added each integration time constant. [range=(0,1); units=A;].
-
float Iinject
- A constant current to be injected into the LIF neuron. [units=A; range=(-1,1);].
-
float a
- A constant (0.02, 01) describing the coupling of variable u to Vm;.
-
float b
- A constant controlling sensitivity og u.
-
float c
- A constant controlling reset of Vm (1000*Vreset).
-
float d
- A constant controlling reset of u.
Protected Attributes
-
double Vm
- The membrane voltage
[readonly; units=V;].
-
double Vb
- The membrane voltage in millivolt.
-
double Vint
- The membrane voltage in millivolt.
-
double u
- internal variable
-
double ub
- The internal variable u adapted to millivolt and millisecond.
-
float Isyn
- synaptic input current
Private Attributes
-
int nStepsInRefr
- If positive then this counter tells us how many time steps we are still in the absolute refractory period.
-
double C1
- Internal constants for the exponential Euler integration of Vm.
Friends