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CbNeuron Class Reference

#include <cbneuron.h>

Inheritance diagram for CbNeuron:

List of all members.

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Detailed Description

A single compartment neuron with an arbitrary number of channels and current supplying synapses.

Model

The membrane voltage is governed by

with the following meanings of symbols

• membrane capacity (Farad)
• reversal potential of the leak current (Volts)
• membrane resistance (Ohm)
• total number of channels (active + synaptic)
• current conductance of channel (Siemens)
• reversal potential of channel (Volts)
• total number of current supplying synapses
• current supplied by synapse (Ampere)
• injected current (Ampere)

At time ist set to .

The value of is calculated to compensate for ionic currents such that actually has a resting value of .

Spiking and reseting the membrane voltage

If the membrane voltage exceeds the threshold the CbNeuron sends a spike to all its outgoing synapses.

The membrane voltage is reseted and clamped during the absolute refractory period of length to if the flag doReset=1. This is similar to a LIF neuron (see LifNeuron).

If the flag doReset=0 the membrane voltage is not reseted and the above equation is also applied during the absolute refractory period but the event of threshold crossing is transmitted as a spike to outgoing synapses. This is usfull if one includes channels which produce a real action potential (see HH_K_Channel and HH_Na_Channel ) but one still just wants to communicate the spikes as events in time.

Implementation

The exponential Euler method is used for numerical integration.

Public Member Functions

• void reset (void)

  Reset the CbNeuron.
  
  

• 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.
  
  

• virtual int addIncoming (Advancable *s)

  Add an incoming channels.
  
  

• virtual int addOutgoing (Advancable *s)

  Add an outgoing channels.
  
  

Public Attributes

• float Vthresh

  If exceeds a spike is emmited. [units=V; range=(-10,100);].
  
  

• float Vreset

  The voltage to reset to after a spike. [units=V; range=(-1,1);].
  
  

• int doReset

  Flag which determines wheter should be reseted after a spike [units=flag; range=(0,1);];.
  
  

• float Trefract

  Length of the absolute refractory period. [units=sec; range=(0,1);].
  
  

Protected 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.
  
  

• bool spike

  W temporal place to store wether we want to spike or not.
  
  

Friends

• class csimClassInfoDB

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Member Function Documentation

void CbNeuron::reset (  void    )  [virtual]

Reset the CbNeuron. is set to is calculated such that for no input relaxes to : Reimplemented from MembranePatch.

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