because of the spike time stored in unordered time, so I get problem ablout the use of stdp_synapse.
21 Oct
2020
21 Oct
'20
10:23 a.m.
Dear all! I want to know how to use stdp_synapse correctly but I noticed there is a
sentence 'Another important point is that spikes do NOT pass the Connection object in
correct order of biological arrival time—they are unordered in time' about the
overview of stdp_synapse; it's the last part of spike handling at website
https://nest.github.io/nest-simulator/synapses_overview. So if these spike time are
unordered, whether the stdp_synapse function would mimic properly.
23 Oct
23 Oct
12:56 p.m.
Hi,
Thanks for pointing this out! Please note that the calculations are
correct and the causality guaranteed. We agree that the wording is
somewhat misleading in the documentation and are working on improving it.
At a single synapse, the spikes arrive in their natural order. Only when
viewed across synapses, the spike may arrive earlier at one synapse than
at another, although the first one has a greater delay.
Hope this helps; please let us know if otherwise!
Best regards,
Sara
On 21.10.20 10:23, 1240288839(a)qq.com wrote:
Dear all! I want to know how to use stdp_synapse
correctly but I
noticed there is a sentence 'Another important point is that spikes do
NOT pass the Connection object in correct order of biological arrival
time—they are unordered in time' about the overview of stdp_synapse;
it's the last part of spike handling at website
https://nest.github.io/nest-simulator/synapses_overview. So if these
spike time are unordered, whether the stdp_synapse function would
mimic properly. _______________________________________________ NEST
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Computational and Systems Neuroscience
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Email: s.konradi(a)fz-juelich.de
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26 Oct
26 Oct
2:55 p.m.
I am sorry for my late reply and thanks for your answer. But I get another question about.
What do you mean, that the spike may arrive earlier at one synapse than at another,
although the first one has a greater delay? I will give a example to show my question
clearly.
Here is a situation I am involved. Supposed there are two neurons named A and B, and they
are connected to neuron C using stdp_synapse. During one simulation, A and B may both
activate many times. Also, I suppose that A send two spikes named t1 and t2, and B send
three spikes t3,t4 and t5, so my question is how you calculate the A-C weight or B-C
weight according to STDP rule.? As you said, if there is a synapse, I can easily
understand how the stdp_synapse work or calculate, but when there are synapses, I am
confused.
Thanks for your answer again! And if I didn't make my question clearly I can explain
more clearly.
4:01 p.m.
Dear 1240288839,
you can regard the calculation of the weights A-C and B-C as being
completely independent.
The article
https://link.springer.com/article/10.1007/s00422-008-0233-1
explains how this works in a broad class of STDP models.
Regards,
Markus
On 10/26/20 2:55 PM, 1240288839(a)qq.com wrote:
I am sorry for my late reply and thanks for your
answer. But I get another question about. What do you mean, that the spike may arrive
earlier at one synapse than at another, although the first one has a greater delay? I will
give a example to show my question clearly.
Here is a situation I am involved. Supposed there are two neurons named A and B, and
they are connected to neuron C using stdp_synapse. During one simulation, A and B may both
activate many times. Also, I suppose that A send two spikes named t1 and t2, and B send
three spikes t3,t4 and t5, so my question is how you calculate the A-C weight or B-C
weight according to STDP rule.? As you said, if there is a synapse, I can easily
understand how the stdp_synapse work or calculate, but when there are synapses, I am
confused.
Thanks for your answer again! And if I didn't make my question clearly I can explain
more clearly.
_______________________________________________
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Inst of Neuroscience and Medicine (INM-6) Tel +49-2461-61-4748 (secr)
Computational and Systems Neuroscience & +49-2461-61-9301 (lab)
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Theoretical Neuroscience Mob +49-175-290-1943
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Jülich, Germany
Department of Psychiatry, Psychotherapy and Psychosomatics
School of Medicine, RWTH Aachen University
Aachen, Germany
www.nest-initiative.org www.csn.fz-juelich.de
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4 comments
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participants (3)
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1240288839＠qq.com -
Markus Diesmann -
Sara Konradi