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LifBurstNeuron Class Reference

#include <lifburstneuron.h>

Inheritance diagram for LifBurstNeuron:

List of all members.

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Detailed Description

A nonstandart leaky-integrate-and-fire (I&F) neuron.

that produces bursts dependent on two additional variables analog to the implementation of dynamical synapses: see Kaske&Bertschinger "Traveling wave patterns..."

Model

A nonstandard leaky-integrate-and-fire neuron model is implemented where the membrane potential of a neuron is given by

where is the membrane time constant, 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. Vreset is modulated by u and r to produce spiking dependent on the previous spike pattern 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 exponential 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 default voltage to reset to after a spike. [units=V;range=(-1,1);].
  
  

• float VBthresh

  spike pattern dependent treshold 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 uB

  internal parameter uB - recovery from spike facilitation with time constant FB
  
  

• float rB

  internal parameter rB - recovery from spike depression with time constant DB
  
  

• float FB

  FB time constant for recovery from facilitation of spike generation.
  
  

• float DB

  DB time constant for recovery from depression of spike generation.
  
  

• float UB

  UB constant for onset of facilitation of spike generation.
  
  

Protected Attributes

• double Vm

  The membrane voltage [readonly; units=V;].
  
  

• 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.
  
  

• double C2

  Internal constants for the exponential Euler integration of Vm.
  
  

• double I0

  Internal constants for the exponential Euler integration of Vm.
  
  

• float uB0

  uB0, rBO updated during spike,control facilitation and depression
  
  

• double C3

  C3, C4 internal constants for exponential Euler integration of uB and rB.
  
  

• double C4

  C3, C4 internal constants for exponential Euler integration of uB and rB.
  
  

Friends

• class csimClassInfoDB

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