Connection is the abstract base class of all classes that implement synaptic connections in Auryn. In its basic function Connection objects take spikes from a SpikingGroup (source) and deliver them to a destination of type NeuronGroup. It implements the transmit() function used to add spike induced quantities to certain neuronal state variables. Which state variable is affected is determined via the set_transmitter() member function, which is implemented here as well. Connection has the important purely virtual member function propagate() which is called for each Connection instance in each simulation time step.

Popular descendants of Connection are: SparseConnection, IdentityConnection and TripletConnection.