# iaf_cond_exp_sfa_rr – Conductance based leaky integrate-and-fire model with spike-frequency adaptation and relative refractory mechanisms¶

## Description¶

`iaf_cond_exp_sfa_rr`

is an implementation of a spiking neuron using
integrate-and-fire dynamics with conductance-based synapses, with additional
spike-frequency adaptation and relative refractory mechanisms as described in
[2], page 166.

Incoming spike events induce a postsynaptic change of conductance modelled by an exponential function. The exponential function is normalized such that an event of weight 1.0 results in a peak current of 1 nS.

Outgoing spike events induce a change of the adaptation and relative refractory
conductances by `q_sfa`

and `q_rr`

, respectively. Otherwise these conductances
decay exponentially with time constants `tau_sfa`

and `tau_rr`

, respectively.

See also [1].

## Parameters¶

The following parameters can be set in the status dictionary.

V_m |
mV |
Membrane potential |

E_L |
mV |
Leak reversal potential |

C_m |
pF |
Capacity of the membrane |

t_ref |
ms |
Duration of refractory period |

V_th |
mV |
Spike threshold |

V_reset |
mV |
Reset potential of the membrane |

E_ex |
mV |
Excitatory reversal potential |

E_in |
mV |
Inhibitory reversal potential |

g_L |
nS |
Leak conductance |

tau_syn_ex |
ms |
Exponential decay time constant of excitatory synaptic conductance kernel |

tau_syn_in |
ms |
Exponential decay time constant of inhibitory synaptic conductance kernel |

q_sfa |
nS |
Outgoing spike activated quantal spike-frequency adaptation conductance increase in nS |

q_rr |
nS |
Outgoing spike activated quantal relative refractory conductance increase in nS |

tau_sfa |
ms |
Time constant of spike-frequency adaptation in ms |

tau_rr |
ms |
Time constant of the relative refractory mechanism in ms |

E_sfa |
mV |
Spike-frequency adaptation conductance reversal potential in mV |

E_rr |
mV |
Relative refractory mechanism conductance reversal potential in mV |

I_e |
pA |
Constant input current |

## Sends¶

SpikeEvent

## Receives¶

SpikeEvent, CurrentEvent, DataLoggingRequest