SimpleSynapse Class Reference

A synapse. More...

Inheritance diagram for SimpleSynapse:

Public Member Functions
	SimpleSynapse (Time *time, StochasticEventGenerator *e, double weight, double revPot, double peak, double tau)
	Construct. More...
	SimpleSynapse (Time *time, StochasticVariable *s, double weight, double revPot, double tau)
	Construct. More...
virtual void	prepareNextState ()
	Calculate next state.
virtual void	proceedToNextState ()
	Apply nex time step.
virtual double	calculateNextValue ()
	Calculate next value.
virtual double	calculateCurrentValue ()
	Calculate current value.
	~SimpleSynapse ()
	Destruct.
virtual void	setParameter (const string &name, const string &value)
	Set parameter. More...
virtual string	getParameter (const string &name) const
	Get parameter. More...
Public Member Functions inherited from Synapse
	Synapse (Time *time, StochasticEventGenerator *e, double weight, double revPot, const string &name="", const string &type="Synapse")
	Construct. More...
	~Synapse ()
	Destruct.
Public Member Functions inherited from StochasticFunction
	StochasticFunction (class Time *time, const string &name="", const string &type="Stochastic Function")
	Create.
double	operator() (double x)
	Returns the value at the current time step. More...
double	d (double x)
	Returns the increment at the current time step. More...
virtual double	getCurrentValue (double x)
	Returns the value at the next time step. More...
virtual double	getNextValue (double x)
	Returns the value at the next time step. More...
virtual double	getIncrement (double xt)
	Returns the increment at the current time step. More...
Public Member Functions inherited from StochasticProcess
	StochasticProcess (class Time *time, const string &name="", const string &type="Stochastic")
	Create.
virtual	~StochasticProcess ()
	Destroy.
bool	isNextStatePrepared ()
	Whether.
virtual double	getIncrement ()
	Returns the increment. More...
virtual double	getCurrentValue ()
	Returns the value of the process. More...
virtual double	getNextValue ()
	Returns the next value of the process. More...
virtual void	setNextValue (double d)
	Set the next value of the process. More...
virtual void	setCurrentValue (double d)
	Set the current value of the process. More...
void	setDescription (string s)
	Set stochastic description.
virtual void	init ()
	Initialise time-dependent values.
string	getDescription ()
	Get the name. More...
Public Member Functions inherited from Parametric
string	getType () const
	Type of object.
string	getName () const
	Name of object.
void	setName (const string &name)
	Name of object.
string	getConfiguration () const
	Returns the configuration of the object. More...
string	getAllParameters () const
	String with all parameter settings.
void	addParameter (const string &name)
	Add a parameter. More...
void	rmParameter (const string &name)
	Remove a parameter. More...
Public Member Functions inherited from TimeDependent
	TimeDependent (class Time *time)
	Construct. More...
virtual class Time *	getTime () const
	Return pointer to the time object.
Public Member Functions inherited from Physical
	Physical ()
	Construct.
	Physical (const Physical &)
	Copy.
	Physical (string name)
	Construct.
	Physical (string name, string unitPrefix, string unitSymbol)
	Construct.
	Physical (string name, Unit unit)
	Construct.
virtual string	getPhysicalDescription ()
	Returns the physical description. More...
virtual string	getUnitName ()
	Returns the unit name.
virtual string	getUnitSymbol ()
	Returns the unit name.
virtual void	setPhysicalDescription (string name)
	Set the name. Same as setDescription(). More...
virtual void	setUnit (Unit u)
	Set the unit.
virtual void	setUnitPrefix (int n)
	Set unit prefix. More...
virtual Unit	getUnit () const
	Retrieve the unit.

Protected Attributes
DifferentialEquation	differential
	Differential equation. More...
StochasticVariable *	stochastic
	Noise source. More...
Protected Attributes inherited from StochasticProcess
double	stochCurrentValue
	the current value
double	stochNextValue
	the next value (direct future)
bool	stochNextStateIsPrepared
	whether prepareNextState() was successful
string	stochDescription
	the name of the quantity

Additional Inherited Members
Protected Member Functions inherited from Parametric
	Parametric (const string &name, const string &type)
	Create object of type and name.
virtual	~Parametric ()
	Destroy object.

Detailed Description

A synapse.

This class implements a synapse which is characterized by a differential equation. Main feature is the transformation of digital signals from an Event object (usually a neuron) to analog values of a StochasticProcess object, which then are part of the membrane equation of another neuron. It also possible to use a noise source (such as a Wiener process) as input. This depends on the constructor you use. Since a synapse usually connects from one single neuron to another single neuron, this class is set to be active as default, i.e. is forwarded automatically and you don't have to use proceedToNextState() and prepareNextState() inside your program.

Constructor & Destructor Documentation

SimpleSynapse::SimpleSynapse	(	Time *	time,
		StochasticEventGenerator *	e,
		double	weight,
		double	revPot,
		double	peak,
		double	tau
	)

Construct.

Will construct a synapse, which will set its value to the peak conductance just after the pre-synaptic spike, and decay the value according to the given time constant. At the next pre-synaptic spike the value will be set to the peak conductance again.

Parameters

time	pointer to main time object
e	The object providing the events (spikes), i.e. the pre-synaptic neuron.
weight	Weight of the synapse.
revPot	Reversal potential of synapse.
peak	Peak conductance of synapse.
tau	Decay time constant.

SimpleSynapse::SimpleSynapse	(	Time *	time,
		StochasticVariable *	s,
		double	weight,
		double	revPot,
		double	tau
	)

Construct.

Will construct a synapse, which will set its value to the peak conductance just after the pre-synaptic spike, and decay the value according to the given time constant. At the next pre-synaptic spike the value will be set to the peak conductance again.

Parameters

time	pointer to main time object
s	The object providing the stimulus.
weight	Weight of the synapse.
revPot	Reversal potential of synapse.
tau	Decay time constant.

Member Function Documentation

virtual string SimpleSynapse::getParameter ( const string &  name ) const

virtual

Get parameter.

In a derived class, override this to handle every parameter you implement. If a parameter is described using multiple strings separated by space, this indicates a parameter of a parameter.

Parameters

name	name of parameter

Reimplemented from Synapse.

virtual void SimpleSynapse::setParameter ( const string &  name, const string &  value  )

virtual

Set parameter.

Sets the value of a parameter using strings. If a parameter is described using multiple strings separated by space, this indicates a parameter of a parameter.

Parameters

name	name of parameter
value	value of parameter (used with operator<<)

Reimplemented from Synapse.

Member Data Documentation

DifferentialEquation SimpleSynapse::differential

protected

Differential equation.

The rate equation.

StochasticVariable* SimpleSynapse::stochastic

protected

Noise source.

only used when the noise constructor was used