Hello,
I have some questions regarding the iaf_psc_exp model. When it receives current from a current generator (with static synapse), does that current go to receptor_type 0 and not be filtered through an exponential kernel?
Secondly, I would like to confirm if the exponential PSCs follow the exponential function:: i_syn(t) = (q / tau_syn) * exp(-t / tau_syn) * Θ(t) , where Θ(t) is the Heaviside step function defined as Θ(t) = 1 fot t >0 and Θ(t) = 0 otherwise. Additionally, is q chosen to be equal to tau_syn?
Thank you very much!
Best regards, Anh Phan
Hello Anh,
We have revised documentation for iaf_psc_exp including equations almost ready. You can preview it at
https://nest-simulator--3084.org.readthedocs.build/en/3084/models/iaf_psc_ex...
I hope it answers your questions. If there should still be something unclear, feel free to comment in the pertaining pull request
https://github.com/nest/nest-simulator/pull/3084
Best, Hans Ekkehard
--
Prof. Dr. Hans Ekkehard Plesser
Department of Data Science Faculty of Science and Technology Norwegian University of Life Sciences PO Box 5003, 1432 Aas, Norway
Phone +47 6723 1560 Email hans.ekkehard.plesser@nmbu.nomailto:hans.ekkehard.plesser@nmbu.no Home http://arken.nmbu.no/~plesser
From: anh.phan@tuni.fi anh.phan@tuni.fi Date: Monday, 1 April 2024 at 13:46 To: users@nest-simulator.org users@nest-simulator.org Subject: [NEST Users] Questions regarding the iaf_psc_exp model [Some people who received this message don't often get email from anh.phan@tuni.fi. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
Hello,
I have some questions regarding the iaf_psc_exp model. When it receives current from a current generator (with static synapse), does that current go to receptor_type 0 and not be filtered through an exponential kernel?
Secondly, I would like to confirm if the exponential PSCs follow the exponential function:: i_syn(t) = (q / tau_syn) * exp(-t / tau_syn) * Θ(t) , where Θ(t) is the Heaviside step function defined as Θ(t) = 1 fot t >0 and Θ(t) = 0 otherwise. Additionally, is q chosen to be equal to tau_syn?
Thank you very much!
Best regards, Anh Phan _______________________________________________ NEST Users mailing list -- users@nest-simulator.org To unsubscribe send an email to users-leave@nest-simulator.org
Thank you very much. I am still wondering whether the current received from a current generator (with static synapse) is considered as I_e in the membrane potential equation. And I have the same question when current is received from a spike generator. Additionally, I'd like to confirm whether I_syn only refers to the currents generated by the presynaptic neurons when they spike. And is I_syn,ex from synapse with positive weight, while I_syn,in from synapse with negative weight? Apart from this, everything else appears clear to me.
Thank you again for your time and assistance.
I mean current received from current generator and spike generator with static synapse will go to receptor_type0, is that correct?
Dear Anh,
* Current input to receptor_type 0 goes directly into the neuron, in the same way as I_e, no additional filtering. If you connect without specifying a receptor, receptor_type 0 is used by default. * Spikes from a presynaptic neuron evoke postsynaptic currents I_syn in the receiving neuron. Spikes through connections with positive weights contribute to I_syn,ex, while spikes arriving with negative weights go to I_syn,in.
Best regards, Hans Ekkehard
--
Prof. Dr. Hans Ekkehard Plesser
Department of Data Science Faculty of Science and Technology Norwegian University of Life Sciences PO Box 5003, 1432 Aas, Norway
Phone +47 6723 1560 Email hans.ekkehard.plesser@nmbu.nomailto:hans.ekkehard.plesser@nmbu.no Home http://arken.nmbu.no/~plesser
From: anh.phan@tuni.fi anh.phan@tuni.fi Date: Monday, 1 April 2024 at 18:19 To: users@nest-simulator.org users@nest-simulator.org Subject: [NEST Users] Re: Questions regarding the iaf_psc_exp model [Some people who received this message don't often get email from anh.phan@tuni.fi. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
I mean current received from current generator and spike generator with static synapse will go to receptor_type0, is that correct? _______________________________________________ NEST Users mailing list -- users@nest-simulator.org To unsubscribe send an email to users-leave@nest-simulator.org
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anh.phan＠tuni.fi -
Hans Ekkehard Plesser