Inputs

Note: these descriptions have been updated to the latest NeuroML v2beta definitions, using the latest version of LEMS!

Inputs

A number of ComponentTypes for providing spiking and current inputs to other ComponentTypes

Original LEMS ComponentType definitions: Inputs.xml
Schema against which NeuroML based on these should be valid: NeuroML_v2beta.xsd

basePointCurrent
Base type for all ComponentTypes which produce a current i (with dimension current)
Exposures	i The total (time varying) current produced by this ComponentType	current

baseVoltageDepPointCurrent extends basePointCurrent
Base type for all ComponentTypes which produce a current i (with dimension current) and require a membrane potential v exposed on the parent Component
Exposures	i (from basePointCurrent)	current
Requirements	v The current may vary with the voltage exposed by the ComponentType on which this is placed	voltage

basePointCurrentDL
Base type for all ComponentTypes which produce a dimensionless current I. There will eventually be dimensionless equivalents of all the core current producing ComponentTypes such as pulseGenerator, sineGenerator and rampGenerator
Exposures	I The total (time varying) current produced by this ComponentType	Dimensionless

baseVoltageDepPointCurrentDL extends basePointCurrentDL
Base type for all ComponentTypes which produce a dimensionless current I and require a dimensionless membrane potential V exposed on the parent Component
Exposures	I (from basePointCurrentDL)	Dimensionless
Requirements	V The current may vary with the voltage exposed by the ComponentType on which this is placed	Dimensionless

baseSpikeSource
Base for any ComponentType whose main purpose is to emit spikes. The exposed variable tsince* can be used for plotting the time since the Component has spiked last*
Exposures	tsince Time since the last spike was emitted	time
Event Ports	spike Port on which spikes are emitted	Direction: out

spikeGenerator extends baseSpikeSource
Simple generator of spikes at a regular interval set by period.
Parameters	period Time between spikes. First spike will be emitted after this time.	time
Exposures	tsince (from baseSpikeSource)	time
Event Ports	spike (from baseSpikeSource)	Direction: out
Dynamics	State Variables tsince time (exposed as tsince) On Start tsince = 0 On Conditions IF tsince > period THEN tsince = 0 EVENT OUT on port spike Time Derivatives d tsince /dt = 1

spikeGeneratorRandom extends baseSpikeSource
Generator of spikes with a random interspike interval of at least minISI and at most maxISI
Parameters	maxISI Maximum interspike interval	time
Parameters	minISI Minimum interspike interval	time
Constants	MSEC = 1ms	time
Exposures	isi The interval until the next spike	time
Exposures	tsince (from baseSpikeSource)	time
Event Ports	spike (from baseSpikeSource)	Direction: out
Dynamics	State Variables tsince time (exposed as tsince) isi time (exposed as isi) On Start tsince = 0 isi = minISI + MSEC * random((maxISI - minISI) / MSEC) On Conditions IF tsince >= isi THEN isi = minISI + MSEC * random((maxISI - minISI) / MSEC) tsince = 0 EVENT OUT on port spike Time Derivatives d tsince /dt = 1

pulseGenerator extends basePointCurrent
Generates a constant current pulse of a certain amplitude for a specified duration after a delay
Parameters	amplitude Amplitude of current pulse	current
	delay Delay before change in current. Current is zero prior to this.	time
	duration Duration for holding current at amplitude. Current is zero after delay + duration.	time
Exposures	i (from basePointCurrent)	current
Event Ports	in Note this is not used here. Will be removed in future	Direction: in
Dynamics	State Variables i current (exposed as i) On Conditions IF t < delay THEN i = 0 IF t >= delay AND t < duration + delay THEN i = amplitude IF t >= duration + delay THEN i = 0 On Events EVENT IN on port: in

pulseGeneratorDL extends basePointCurrentDL
Dimensionless equivalent of pulseGenerator. Generates a constant current pulse of a certain amplitude for a specified duration after a delay
Parameters	amplitude Amplitude of current pulse	Dimensionless
	delay Delay before change in current. Current is zero prior to this.	time
	duration Duration for holding current at amplitude. Current is zero after delay + duration.	time
Exposures	I (from basePointCurrentDL)	Dimensionless
Event Ports	in Note this is not used here. Will be removed in future	Direction: in
Dynamics	State Variables I Dimensionless (exposed as I) On Conditions IF t < delay THEN I = 0 IF t >= delay AND t < duration + delay THEN I = amplitude IF t >= duration + delay THEN I = 0 On Events EVENT IN on port: in

sineGenerator extends basePointCurrent
Generates a sinusoidally varying current after a time delay, for a fixed duration. The period and maximum amplitude of the current can be set as well as the phase at which to start.
Parameters	amplitude	current
	delay	time
	duration	time
	period	time
	phase	Dimensionless
Exposures	i (from basePointCurrent)	current
Event Ports	in	Direction: in
Dynamics	State Variables i current (exposed as i) On Conditions IF t < delay THEN i = 0 IF t >= delay AND t < duration+delay THEN i = amplitude * sin(phase + (2 * 3.14159265 * (t-delay)/period) ) IF t >= duration+delay THEN i = 0 On Events EVENT IN on port: in

rampGenerator extends basePointCurrent
Generates a ramping current after a time delay, for a fixed duration. During this time the current steadily changes from startAmplitude to finishAmplitude.
Parameters	baselineAmplitude	current
	delay	time
	duration	time
	finishAmplitude	current
	startAmplitude	current
Exposures	i (from basePointCurrent)	current
Event Ports	in	Direction: in
Dynamics	State Variables i current (exposed as i) On Start i = baselineAmplitude On Conditions IF t < delay THEN i = baselineAmplitude IF t >= delay AND t < duration+delay THEN i = startAmplitude + (finishAmplitude - startAmplitude) * (t - delay) / (duration) IF t >= duration+delay THEN i = baselineAmplitude On Events EVENT IN on port: in

rampGeneratorDL extends basePointCurrentDL
Generates a ramping current after a time delay, for a fixed duration. During this time the dimensionless current steadily changes from startAmplitude to finishAmplitude.
Parameters	baselineAmplitude	Dimensionless
	delay	time
	duration	time
	finishAmplitude	Dimensionless
	startAmplitude	Dimensionless
Exposures	I (from basePointCurrentDL)	Dimensionless
Event Ports	in	Direction: in
Dynamics	State Variables I Dimensionless (exposed as I) On Start I = baselineAmplitude On Conditions IF t < delay THEN I = baselineAmplitude IF t >= delay AND t < duration+delay THEN I = startAmplitude + (finishAmplitude - startAmplitude) * (t - delay) / (duration) IF t >= duration+delay THEN I = baselineAmplitude On Events EVENT IN on port: in

voltageClamp extends baseVoltageDepPointCurrent
Voltage clamp. Applies a variable current i to try to keep parent at targetVoltage.* Not yet fully tested!!!*
Parameters	delay Delay before change in current. Current is zero prior to this.	time
	duration Duration for attempting to keep parent at targetVoltage. Current is zero after delay + duration.	time
	seriesResistance Current will be calculated by the difference in voltage between the target and parent, divided by this value	resistance
	targetVoltage Current will be applied to try to get parent to this target voltage	voltage
Exposures	i (from basePointCurrent)	current
Requirements	v (from baseVoltageDepPointCurrent)	voltage
Event Ports	in Note this is not used here. Will be removed in future	Direction: in
Dynamics	State Variables i current (exposed as i) On Conditions IF t < delay THEN i = 0 IF t >= delay THEN i = 1e-5 * (targetVoltage - v) / seriesResistance IF t > duration + delay THEN i = 0 On Events EVENT IN on port: in

spikeArray extends baseSpikeSource
Set of spike ComponentTypes, each emitting one spike at a certain time. Can be used to feed a predetermined spike train into a cell
Children elements	spike	spike
Exposures	tsince (from baseSpikeSource)	time
Event Ports	in This will receive events from the children	Direction: in
Event Ports	spike (from baseSpikeSource)	Direction: out
Dynamics	State Variables tsince time (exposed as tsince) On Start tsince = 0 On Events EVENT IN on port: in tsince = 0 EVENT OUT on port spike Time Derivatives d tsince /dt = 1

spike extends baseSpikeSource
Emits a single spike at the specified time
Parameters	time Time at which to emit one spike event	time
Exposures	spiked 0 signals not yet spiked, 1 signals has spiked	Dimensionless
Exposures	tsince (from baseSpikeSource)	time
Event Ports	spike (from baseSpikeSource)	Direction: out
Dynamics	Structure WITH this AS a WITH parent AS b EVENT CONNECTION from a TO b State Variables tsince time (exposed as tsince) spiked Dimensionless (exposed as spiked) On Start tsince = 0 On Conditions IF (t >= time) AND (spiked = 0) THEN spiked = 1 tsince = 0 EVENT OUT on port spike Time Derivatives d tsince /dt = 1