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LifNeuron Class Reference

#include <lifneuron.h>

Inheritance diagram for LifNeuron:

List of all members.

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Detailed Description

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

Model

A standard 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.

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 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);].
  
  

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.
  
  

Friends

• class csimClassInfoDB

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