nest::SynapticElement Class Reference

Synaptic element of a node (axonal bouton or dendritic spine) for the purposes of structural plasticity. More...

#include <synaptic_element.h>

Collaboration diagram for nest::SynapticElement:

Public Member Functions
	SynapticElement ()
	SynapticElement (const SynapticElement &se)
SynapticElement &	operator= (const SynapticElement &other)
	~SynapticElement ()
void	get (Dictionary &d) const
	Store current values in a dictionary.
void	set (const Dictionary &d)
	Set values from a dictionary.
void	update (double t, double t_minus, double Ca_minus, double tau_Ca)
	Updates the number of available synaptic elements according to the mean calcium concentration of the neuron at time t.
int	get_z_vacant () const
	Get the number of synaptic_element at the time t (in ms)
int	get_z_connected () const
	Retrieves the current number of synaptic elements bound to a synapse.
double	get_tau_vacant () const
	Retrieves the value of tau_vacant.
void	connect (int n)
	Changes the number of bound synaptic elements by n.
void	set_growth_curve (GrowthCurve &g)
	Used to define the dynamics of the synaptic elements using a Growth Curve.
double	get_growth_rate () const
	Retrieves the current value of the growth rate.
void	set_z (const double z_new)
double	get_z () const
void	decay_z_vacant ()
	Reduce the amount of vacant synaptic elements by a factor of tau_vacant_.
bool	continuous () const

Private Attributes
double	z_
double	z_t_
int	z_connected_
bool	continuous_
double	growth_rate_
double	tau_vacant_
GrowthCurve *	growth_curve_

Detailed Description

Synaptic element of a node (axonal bouton or dendritic spine) for the purposes of structural plasticity.

The synaptic elements represent connection points between two neurons that grow according to a homeostatic growth rule. Basically, the dynamics of the number of synaptic elements is driven by the average electrical activity of the neuron (indirectly measured through the Calcium concentration of the node). The probability of two neurons creating a new synapse between them, depends on the number of available synaptic elements of each neuron.

Constructor & Destructor Documentation

SynapticElement() [1/2]

nest::SynapticElement::SynapticElement

(

)

SynapticElement() [2/2]

nest::SynapticElement::SynapticElement

(

const SynapticElement &

se

)

References get(), nest::GrowthCurve::get_name(), growth_curve_, nest::kernel(), nest::SPManager::new_growth_curve(), nest::GrowthCurve::set(), and nest::KernelManager::sp_manager.

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~SynapticElement()

nest::SynapticElement::~SynapticElement ( )

inline

References growth_curve_.

Member Function Documentation

connect()

void nest::SynapticElement::connect ( int  n )

inline

Changes the number of bound synaptic elements by n.

Parameters

n	number of new connections. Can be negative.

References z_, and z_connected_.

continuous()

bool nest::SynapticElement::continuous ( ) const

inline

References continuous_.

decay_z_vacant()

void nest::SynapticElement::decay_z_vacant ( )

inline

Reduce the amount of vacant synaptic elements by a factor of tau_vacant_.

References get_z_vacant(), tau_vacant_, and z_.

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get()

void nest::SynapticElement::get

(

Dictionary &

d

)

const

Store current values in a dictionary.

Parameters

d	to write data

References nest::names::continuous(), continuous_, nest::GrowthCurve::get(), growth_curve_, nest::names::growth_rate(), growth_rate_, nest::names::tau_vacant(), tau_vacant_, nest::names::z(), z_, nest::names::z_connected(), and z_connected_.

Referenced by SynapticElement().

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get_growth_rate()

double nest::SynapticElement::get_growth_rate ( ) const

inline

Retrieves the current value of the growth rate.

References growth_rate_.

get_tau_vacant()

double nest::SynapticElement::get_tau_vacant ( ) const

inline

Retrieves the value of tau_vacant.

References tau_vacant_.

get_z()

double nest::SynapticElement::get_z ( ) const

inline

References z_.

get_z_connected()

int nest::SynapticElement::get_z_connected ( ) const

inline

Retrieves the current number of synaptic elements bound to a synapse.

References z_connected_.

get_z_vacant()

int nest::SynapticElement::get_z_vacant ( ) const

inline

Get the number of synaptic_element at the time t (in ms)

Returns a negative number when synaptic elements must be deleted during the next update

Parameters

a	node of this synaptic_element
t	Current time (in ms)

References z_, and z_connected_.

Referenced by decay_z_vacant().

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operator=()

SynapticElement & nest::SynapticElement::operator=

(

const SynapticElement &

other

)

Parameters

other

SynapticElement

References continuous_, growth_curve_, growth_rate_, nest::kernel(), nest::SPManager::new_growth_curve(), nest::GrowthCurve::set(), nest::KernelManager::sp_manager, tau_vacant_, z_, z_connected_, and z_t_.

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set()

void nest::SynapticElement::set

(

const Dictionary &

d

)

Set values from a dictionary.

Parameters

d	to take data from

References nest::names::continuous(), continuous_, nest::names::growth_curve(), growth_curve_, nest::names::growth_rate(), growth_rate_, nest::GrowthCurve::is(), nest::kernel(), nest::SPManager::new_growth_curve(), nest::GrowthCurve::set(), nest::KernelManager::sp_manager, nest::names::tau_vacant(), tau_vacant_, nest::names::z(), and z_.

Referenced by nest::StructuralPlasticityNode::set_status().

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set_growth_curve()

void nest::SynapticElement::set_growth_curve ( GrowthCurve &  g )

inline

Used to define the dynamics of the synaptic elements using a Growth Curve.

References growth_curve_.

set_z()

void nest::SynapticElement::set_z ( const double  z_new )

inline

References z_.

update()

void nest::SynapticElement::update	(	double	t,
		double	t_minus,
		double	Ca_minus,
		double	tau_Ca
	)

Updates the number of available synaptic elements according to the mean calcium concentration of the neuron at time t.

Parameters

t	Current time (in ms)
t_minus	Time of last update
Ca_minus	Calcium concentration at time t_minus
tau_Ca	change in the calcium concentration on each spike

References growth_curve_, growth_rate_, nest::GrowthCurve::update(), z_, and z_t_.

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Member Data Documentation

continuous_

bool nest::SynapticElement::continuous_

private

Referenced by continuous(), get(), operator=(), and set().

growth_curve_

GrowthCurve* nest::SynapticElement::growth_curve_

private

Referenced by get(), operator=(), set(), set_growth_curve(), SynapticElement(), update(), and ~SynapticElement().

growth_rate_

double nest::SynapticElement::growth_rate_

private

Referenced by get(), get_growth_rate(), operator=(), set(), and update().

tau_vacant_

double nest::SynapticElement::tau_vacant_

private

Referenced by decay_z_vacant(), get(), get_tau_vacant(), operator=(), and set().

z_

double nest::SynapticElement::z_

private

Referenced by connect(), decay_z_vacant(), get(), get_z(), get_z_vacant(), operator=(), set(), set_z(), and update().

z_connected_

int nest::SynapticElement::z_connected_

private

Referenced by connect(), get(), get_z_connected(), get_z_vacant(), and operator=().

z_t_

double nest::SynapticElement::z_t_

private

Referenced by operator=(), and update().

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

• synaptic_element.h
• synaptic_element.cpp