Hello Evgenia,
I assume you took the brunel_delta_nest model and just replaced the iaf_psc_delta neuron model with iaf_psc_exp_ps.
For the delta-model, each synaptic input causes an instantaneous jump of the membrane potential by J_ex or J_in, respectively. These are given by J in turn and with the default J=0.1 and g=5, this means excitatory jumps of +0.1 mV and inhibitory jumps of -0.5 mV.
In the iaf_psc_exp* models, on the other hand, the same input weight means that an incoming spike starts a postsynaptic current of 0.1 pA or -0.5 pA, respectively, which then decays exponentially. The resulting membrane potential change may be noticeably smaller. So I would suggest to increase J to see when you get spiking. Don't worry about increasing J by factors rather than small steps.
To look at details, you could also attach a voltmeter to a few neurons so you can see the membrane potential evolution.
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: Evgenia Kartsaki evgenia.kartsaki@inria.fr Date: Friday, 25 August 2023 at 10:41 To: users@nest-simulator.org users@nest-simulator.org Subject: [NEST Users] Network simulation of Hanuschkin (2010) - precise spike times [Some people who received this message don't often get email from evgenia.kartsaki@inria.fr. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
Hello,
I am trying to simulate the network of a model with precise spike times as in Hanuschkin (2010), which is based on the balanced random network of Brunel (2000). As far as I understand the model of Hanuschkin exists already in NEST here: https://nest-simulator.readthedocs.io/en/v3.5/models/iaf_psc_exp_ps.html . However, I haven't found an example of the network simulation. I have tried using the Brunel network (https://nest-simulator.readthedocs.io/en/stable/auto_examples/brunel_delta_n...) with the iaf_psc_exp_ps model, but I got a firing rate (excitatory or inhibitory) of 0 Hz.
I would appreciate any advice on that!
Thanks in advance, Jenny _______________________________________________ NEST Users mailing list -- users@nest-simulator.org To unsubscribe send an email to users-leave@nest-simulator.org