A struct to assign a timing-based E-STDP curve. More...

#include <carlsim_datastructures.h>

Public Member Functions
	TimingBasedCurve (float _alphaPlus, float _tauPlus, float _alphaMinus, float _tauMinus, float _gamma)

Public Attributes
float	alphaMinus
	the amplitude of the exponential curve at post-pre side More...

float	alphaPlus
	the amplitude of the exponential curve at pre-post side More...

float	gamma
	the turn-over point More...

STDPCurve	stdpCurve
	the type of STDP curve More...

float	tauMinus
	the time constant of the exponential curve at post-pre side More...

float	tauPlus
	the time constant of the exponential curve at pre-post side More...

Detailed Description

This E-STDP curve is sensitive to spike timing at the pre-post side. The parameters (_alphaPlus, _tauPlus, gamma) specifies the curve at the pre-post side. The curve is basically an exponential curve, which specified by (_alphaPlus, _tauPlus), transformed by gamma. The value of gamma is the turn-over point. The STDP function at the pre-post side is governed by the following equation:

$STDP(t) = \begin{cases} \alpha^+(1-(1-e^{-\frac{t}{\tau^+}})(\frac{1+e^{-\frac{\gamma}{\tau^+}}}{1-e^{-\frac{\gamma}{\tau^+}}})) & \text{if } t < \gamma \\ -\alpha^+ e^{-\frac{t}{\tau^+}} & \text{if } t \geq \gamma \end{cases}$

Simply, if t is larger than gamma, the STDP function is the mirrored exponential curve along x-axis. If t is smaller than gamma, the STDP function is the exponential curve stretched to the turn-over point. The parameters (_alphaMinus, _tauMinus) specifies the exponential curve at the post-pre side. This curve requires _alphaMinus to be a negative value.

Note: This curve can be applied to E-STDP only.

Parameters

[in]	_alphaPlus	the amplitude of the exponential curve at pre-post side
[in]	_tauPlus	the decay constant of the exponential curve at pre-post side
[in]	_alphaMinus	the amplitude of the exponential curve at post-pre side
[in]	_tauMinus	the decay constant of the exponential curve at post-pre side

Since: v3.0

Definition at line 614 of file carlsim_datastructures.h.

Constructor & Destructor Documentation

◆ TimingBasedCurve()

TimingBasedCurve	(	float	_alphaPlus,
		float	_tauPlus,
		float	_alphaMinus,
		float	_tauMinus,
		float	_gamma
	)

inline

Definition at line 615 of file carlsim_datastructures.h.

Member Data Documentation

◆ alphaMinus

float alphaMinus

Definition at line 629 of file carlsim_datastructures.h.

◆ alphaPlus

float alphaPlus

Definition at line 627 of file carlsim_datastructures.h.

◆ gamma

float gamma

Definition at line 631 of file carlsim_datastructures.h.

◆ stdpCurve

STDPCurve stdpCurve

Definition at line 626 of file carlsim_datastructures.h.

◆ tauMinus

float tauMinus

Definition at line 630 of file carlsim_datastructures.h.

◆ tauPlus

float tauPlus

Definition at line 628 of file carlsim_datastructures.h.

The documentation for this struct was generated from the following file:

carlsim_datastructures.h

Public Member Functions

Public Attributes