Hi!
- Postsynaptic spikes have a "multiplicity" variable. Am I correct that
if I receive a single spike object with a multiplicity value of 3, I actually receive 3 spikes? Since I do only get one time, what are the exact spike times of the other spikes?
As explained in https://nest-simulator.readthedocs.io/en/latest/guides/simulations_with_prec..., spikes are usually constrained to the time grid. A multiplicity of 3 indeed means that the target received 3 spikes at exactly the same time.
The multiplicity is mainly used by spike generators that are expected to have very high rates (like for example the poisson_generator) and lowers the number of function calls in these situation.
- For the postsynaptic spikes I can easily access the spike history and
search for spikes in a certain time range, as for example done in the STDP synapse. Is it possible to also access the overall spike history of presynaptic spikes? So far I only found that in the std_dopamine synapse as an example the last spike time is stored manually.
The spike history of the pre-synaptic neuron is not available directly, as that is oftentimes on a different process. Therefore, the synapse object has to keep a history on its own in case it needs it.
Cheers, Jochen!
-- Dr. Jochen Martin Eppler Phone: +49(2461)61-96653 ---------------------------------- Simulation Laboratory Neuroscience Jülich Supercomputing Centre Institute for Advanced Simulation
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