LeakyIntFire Class Reference

A leaky integrate & fire neuron, used by standard winner-take-all (WTA). More...

#include <Neuro/LeakyIntFire.H>

Collaboration diagram for LeakyIntFire:

Public Member Functions
	LeakyIntFire (const SimTime timeStep=SimTime::SECS(0.0001), const float El=0.0F, const float Ee=100.0e-3F, const float Ei=-20.0e-3F, const float Gl=5.0e-8F, const float Ge=0.0F, const float Gi=0.0F, const float Vth=0.001F, const float C=1.0E-9F)
	constructor
void	input (const float current)
	set input current (A)
void	setV (const double val)
	set membrane potential to given value relative to Ei (in Volts)
bool	integrate (const SimTime &t)
	integrate for up to given time (in s)
float	getV () const
	get current membrane potential (in V)
void	setG (const float Exc, const float Inh)
	set excitatory and inhibitory conductances (S)
void	setGleak (const float Leak)
	set leak conductance (S)
SimTime	getTimeStep () const
	return our internal time step:

Detailed Description

A leaky integrate & fire neuron, used by standard winner-take-all (WTA).

This is the integrate & fire neuron used in conjunction with WTA which is a 2D array of LeakyIntFire. It has a slightly more complicated Euler equation then LeakyIntegrator used by SM but the basic idea is the same. All parameters are in MKSA (SI) units (i.e., volts, amperes, siemens, etc). This neuron uses an Euler integration of the following form:

At each time step,

$V \leftarrow V + \frac{\delta t}{C} \left(I - G_{leak}(V - E_{leak}) - G_{ex}(V - E_{ex}) - G_{inh}(V - E_{inh})\right)$

V is also clamped to never become smaller than $E_{inh}$ and a spike is generated when $V \ge V_{th}$ (and V is then reset to zero).

Definition at line 60 of file LeakyIntFire.H.

Constructor & Destructor Documentation

LeakyIntFire::LeakyIntFire	(	const SimTime	timeStep = `SimTime::SECS(0.0001)`,
		const float	El = `0.0F`,
		const float	Ee = `100.0e-3F`,
		const float	Ei = `-20.0e-3F`,
		const float	Gl = `5.0e-8F`,
		const float	Ge = `0.0F`,
		const float	Gi = `0.0F`,
		const float	Vth = `0.001F`,
		const float	C = `1.0E-9F`
	)			`[inline]`