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MembranePatch Class Reference

#include <membranepatch.h>

Inheritance diagram for MembranePatch:

List of all members.

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Detailed Description

A a patch of membrane 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 MembranePatch 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

• virtual void IandGtot (double *i, double *g)

  Calculate the new membrane voltage and check whether Vm exceeds the threshold V_thresh.
  
  

• virtual void reset (void)

  Reset the MembranePatch.
  
  

Protected Member Functions

• void addBuffer (IonBuffer *newBuffer)

  Call to add a new ion buffer.
  
  

• virtual void addChannel (IonChannel *c)

  Call to add a new ion channel.
  
  

Protected Attributes

• int nBuffers

  Number of ion buffers [readonly; units=;].
  
  

• int lBuffers

  Length of list of ion buffers [hidden].
  
  

• IonBuffer ** buffers

  A list of associated ion buffers [hidden].
  
  

Friends

• class ConcIonGate

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