CbLifNeuron Class Reference

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

#include <LifNeuron.h>

Inheritance diagram for CbLifNeuron:

Collaboration diagram for CbLifNeuron:

List of all members.

Public Member Functions

CbLifNeuron (float Rm=1e6, float Cm=3e-8, float Vresting=-0.06, float Vthresh=-0.045, float Vreset=-0.06, float Vinit=-0.06, float Trefract=3e-3, float Inoise=0.0, float Iinject=0.0)

virtual ~CbLifNeuron ()

virtual int adjust (double dt)

Recalculate exp. Euler constants.

virtual int advance (AdvanceInfo const &)

Advance the leaky I&F neuron.

virtual void clearSynapticInput (void)

virtual void currentInput (double Isyn)

virtual void conductanceInput (double g, double Erev)

virtual double getVm ()

Get the current membrane voltage.

virtual double conductanceNoiseInput ()

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 $V_m$ of a neuron is given by

$\tau_m \frac{d V_m}{dt} = -(V_m-V_{resting}) + R_m \cdot (I_{syn}(t)+I_{inject}+I_{noise})$

where $\tau_m=C_m\cdot R_m$ is the membrane time constant, $R_m$ is the membrane resistance, $I_{syn}(t)$ is the current supplied by the synapses, $I_{inject}$ is a non-specific background current and $I_{noise}$ is a Gaussion random variable with zero mean and a given variance noise.

At time $t=0$ $V_m$ ist set to $V_{init}$ . If $V_m$ exceeds the threshold voltage $V_{thresh}$ it is reset to $V_{reset}$ and hold there for the length $T_{refract}$ of the absolute refractory period.

Implementation

The exponential Euler method is used for numerical integration.

Definition at line 243 of file LifNeuron.h.

Constructor & Destructor Documentation

CbLifNeuron::CbLifNeuron	(	float	Rm = `1e6`,
		float	Cm = `3e-8`,
		float	Vresting = `-0.06`,
		float	Vthresh = `-0.045`,
		float	Vreset = `-0.06`,
		float	Vinit = `-0.06`,
		float	Trefract = `3e-3`,
		float	Inoise = `0.0`,
		float	Iinject = `0.0`
	)

Definition at line 118 of file LifNeuron.cpp.

virtual CbLifNeuron::~CbLifNeuron ( ) [inline, virtual]

Definition at line 259 of file LifNeuron.h.

Member Function Documentation

int CbLifNeuron::adjust ( double dt ) [virtual]

Recalculate exp. Euler constants.

Reimplemented from SimObject.

Definition at line 125 of file LifNeuron.cpp.

References LifNeuronBase::_dt, LifNeuronBase::C1, LifNeuronBase::C2, LifNeuronBase::Cm, LifNeuronBase::I0, LifNeuronBase::Iinject, LifNeuronBase::noise_gen, LifNeuronBase::Rm, ThreadSpecificRandomDistribution< Dist >::set(), and LifNeuronBase::Vresting.

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int CbLifNeuron::advance ( AdvanceInfo const & ai ) [virtual]

Advance the leaky I&F neuron.

Reimplemented from SimObject.

Reimplemented in CompositeNeuron< CbLifNeuron >.

Definition at line 147 of file LifNeuron.cpp.

References LifNeuronBase::_dt, ADVANCEFLAG_HASSPIKED, LifNeuronBase::C1, clearSynapticInput(), LifNeuronBase::Cm, conductanceNoiseInput(), LifNeuronBase::currentNoiseInput(), AdvanceInfo::dt, LifNeuronBase::I0, Time::in_sec(), LifNeuronBase::Inoise, LifNeuronBase::noise_gen, LifNeuronBase::nStepsInRefr, SingleOutputSpikeSender::out_port, LifNeuronBase::Rm, SpikeOutputPort::setSpike(), LifNeuronBase::Trefract, LifNeuronBase::Vm, LifNeuronBase::Vreset, and LifNeuronBase::Vthresh.

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void CbLifNeuron::clearSynapticInput ( void ) [inline, virtual]

Implements LifNeuronBase.

Definition at line 293 of file LifNeuron.h.

Referenced by advance().

void CbLifNeuron::currentInput ( double Isyn ) [inline, virtual]

Reimplemented from CurrentInputTarget.

Definition at line 298 of file LifNeuron.h.

void CbLifNeuron::conductanceInput	(	double	g,
		double	Erev
	)			`[inline, virtual]`

Reimplemented from ConductanceInputTarget.

Definition at line 303 of file LifNeuron.h.

virtual double CbLifNeuron::getVm ( ) [inline, virtual]

Get the current membrane voltage.

Reimplemented from ConductanceInputTarget.

Definition at line 275 of file LifNeuron.h.

References LifNeuronBase::Vm.

virtual double CbLifNeuron::conductanceNoiseInput ( ) [inline, virtual]

Definition at line 280 of file LifNeuron.h.

Referenced by advance().

The documentation for this class was generated from the following files:

/home/tnatschl/PCSIM-Sandbox/pcsim/pcsim/simobjects/LifNeuron.h
/home/tnatschl/PCSIM-Sandbox/pcsim/pcsim/simobjects/LifNeuron.cpp


Public Member Functions
	CbLifNeuron (float Rm=1e6, float Cm=3e-8, float Vresting=-0.06, float Vthresh=-0.045, float Vreset=-0.06, float Vinit=-0.06, float Trefract=3e-3, float Inoise=0.0, float Iinject=0.0)
virtual	~CbLifNeuron ()
virtual int	adjust (double dt)
	Recalculate exp. Euler constants.
virtual int	advance (AdvanceInfo const &)
	Advance the leaky I&F neuron.
virtual void	clearSynapticInput (void)
virtual void	currentInput (double Isyn)
virtual void	conductanceInput (double g, double Erev)
virtual double	getVm ()
	Get the current membrane voltage.
virtual double	conductanceNoiseInput ()