# iaf_psc_alpha_multisynapse – Leaky integrate-and-fire neuron model with multiple ports¶

## Description¶

`iaf_psc_alpha_multisynapse`

is a direct extension of `iaf_psc_alpha`

.
On the postsynaptic side, there can be arbitrarily many synaptic
time constants (`iaf_psc_alpha`

has exactly two: `tau_syn_ex`

and `tau_syn_in`

).

This can be reached by specifying separate receptor ports, each for
a different time constant. The port number has to match the respective
`receptor_type`

in the connectors.

Note

If `tau_m`

is very close to `tau_syn_ex`

or `tau_syn_in`

, the model
will numerically behave as if `tau_m`

is equal to `tau_syn_ex`

or
`tau_syn_in`

, respectively, to avoid numerical instabilities.

For implementation details see the IAF Integration Singularity notebook.

## Sends¶

SpikeEvent

## Receives¶

SpikeEvent, CurrentEvent, DataLoggingRequest