To parallelize short-term plasticity efficiently Auryn allows the transmission of spike attributes. These attributes are floats which can be “attached” to a spike and which are also synced across nodes. Spike attributes are still under development, but I am putting some handwritten notes here to remind myself of how one can think of them being attached to individual spikes and how multiple attributes (imagine a single presynaptic NeuronGroup sends spikes via two different Connections with short-term plasticity to some downstream groups) are to be stored in the attribute buffer which is synced along with the spikes across nodes.