because of the spike time stored in unordered time, so I get problem ablout the use of stdp_synapse.
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.
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@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 Users mailing list -- users@nest-simulator.org To unsubscribe send an email to users-leave@nest-simulator.org
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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.
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@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. _______________________________________________ NEST Users mailing list -- users@nest-simulator.org To unsubscribe send an email to users-leave@nest-simulator.org
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1240288839＠qq.com -
Markus Diesmann -
Sara Konradi