27 Nov
2019
27 Nov
'19
12:49 p.m.
Hi!
1) 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_pre…,
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.
2) 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
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Simulation Laboratory Neuroscience
Jülich Supercomputing Centre
Institute for Advanced Simulation
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Forschungszentrum Juelich GmbH
52425 Juelich
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Vorsitzender des Aufsichtsrats: MinDir Volker Rieke
Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),
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