Subsections
LifBurstNeuron
that produces bursts dependent on two additional variables analog to the implementation of dynamical synapses: see Kaske&Bertschinger "Traveling wave patterns..."
A nonstandard leaky-integrate-and-fire neuron model is implemented where the membrane potential Vm of a neuron is given by
where
is the membrane time constant, Rm is the membrane resistance, Isyn(t) is the current supplied by the synapses, Iinject is a non-specific background current and Inoise is a Gaussion random variable with zero mean and a given variance noise. Vreset is modulated by u and r to produce spiking dependent on the previous spike pattern At time t=0 Vm ist set toVinit . If Vm exceeds the threshold voltageVthresh it is reset to Vreset and hold there for the length Trefract of the absolute refractory period.
The exponential Euler method is used for numerical integration.
- Cm (F) :
- The membrane capacity Cm
- Rm (Ohm) :
- The membrane resistance Rm
- Vthresh (V) :
- If Vm exceeds Vthresh a spike is emmited.
- Vresting (V) :
- The resting membrane voltage.
- Vreset (V) :
- The default voltage to reset Vm to after a spike.
- VBthresh (V) :
- spike pattern dependent treshold Vm to after a spike.
- Vinit (V) :
- The initial condition for Vm at time t=0.
- Trefract (sec) :
- The length of the absolute refractory period.
- Inoise (A) :
- The standard deviation of the noise to be added each integration time constant.
- Iinject (A) :
- A constant current to be injected into the LIF neuron.
- uB :
- internal parameter uB - recovery from spike facilitation with time constant FB
- rB :
- internal parameter rB - recovery from spike depression with time constant DB
- FB :
- FB time constant for recovery from facilitation of spike generation.
- DB :
- DB time constant for recovery from depression of spike generation.
- UB :
- UB constant for onset of facilitation of spike generation.
- type :
- Type (e.g. inhibitory or excitatory) of the neuron
- Vm (V) :
- The membrane voltage Vm
- Isyn :
- synaptic input current
- nIncoming :
- Number of incoming synapses
- nOutgoing :
- Number of outgoing synapses