LifNeuron Class Reference

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

#include <LifNeuron.h>

Inheritance diagram for LifNeuron:

Collaboration diagram for LifNeuron:

List of all members.

Public Member Functions

LifNeuron (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 ~LifNeuron ()

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)

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 169 of file LifNeuron.h.

Constructor & Destructor Documentation

LifNeuron::LifNeuron	(	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 39 of file LifNeuron.cpp.

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

Definition at line 184 of file LifNeuron.h.

Member Function Documentation

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

Recalculate exp. Euler constants.

Reimplemented from SimObject.

Definition at line 46 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 LifNeuron::advance ( AdvanceInfo const & ai ) [virtual]

Advance the leaky I&F neuron.

Reimplemented from SimObject.

Reimplemented in EvLifNeuron, and CompositeNeuron< LifNeuron >.

Definition at line 70 of file LifNeuron.cpp.

References ADVANCEFLAG_HASSPIKED, LifNeuronBase::C1, LifNeuronBase::C2, clearSynapticInput(), LifNeuronBase::currentNoiseInput(), AdvanceInfo::dt, LifNeuronBase::I0, Time::in_sec(), LifNeuronBase::Inoise, LifNeuronBase::noise_gen, LifNeuronBase::nStepsInRefr, SingleOutputSpikeSender::out_port, SpikeOutputPort::setSpike(), LifNeuronBase::Trefract, LifNeuronBase::Vm, LifNeuronBase::Vreset, and LifNeuronBase::Vthresh.

Referenced by EvLifNeuron::advance().

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

Implements LifNeuronBase.

Definition at line 205 of file LifNeuron.h.

Referenced by advance().

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

Reimplemented from CurrentInputTarget.

Reimplemented in EvLifNeuron.

Definition at line 210 of file LifNeuron.h.

Referenced by EvLifNeuron::currentInput().

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
	LifNeuron (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	~LifNeuron ()
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)