Re: parrot neurons PORT 1 - NEST Users

1 Nov 2019


      Dear Nikolas,
Could the following example in NEST Simulator be what you're looking for?
https://github.com/nest/nest-simulator/blob/f28b138f469354264f65c3b5c9d05e56...
"""Check STDP protocol between two parrot_neurons connected by a stdp_synapse.  Exact pre- and post-synaptic spike times are set by spike_generators  connected to each parrot neuron. Additional spikes sent through the  stdp_synapse are explicitly ignored in the postsynaptic parrot_neuron  by setting the stdp_synapse to connect to port 1. """
With kind regards,
Charl
On Wed, Oct 30, 2019, at 11:58, Nikolaos Chrysanthidis wrote:
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Hi Charl,
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I want to test the weight change of a single synapse providing stimulation at 2 parrot neurons, so for that reason,
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If I excite two pre-,post- parrot neurons (parrot_A,B) using port 0, then the parrot_A will excite the parrot_B as well, so the parrot_B will end up having more spikes than expected.
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I think this can be overcome by using port1 of parrot_B in order to ignore the extra excitation from parrot_A.
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Please, I'd be grateful if you could provide a way to avoid extra excitation from parrot_A onto parrot_B.
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Kind regards,
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Nikolas
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*From:* Charl Linssen nest-users@turingbirds.com
*Sent:* 28 October 2019 12:11
*To:* users@nest-simulator.org
*Subject:* [NEST Users] Re: parrot neurons PORT 1
Dear Nikolaos,
I'm a little confused as to why you wish to use port 1 for this. A synapse is not aware of incoming or outgoing ports, so if you want to test a particular synapse model, you can connect it between port 0 of a presynaptic parrot neuron, and port 0 of a postsynaptic parrot neuron. Could you otherwise please clarify your use case a bit?
With kind regards,
Charl
On Thu, Oct 17, 2019, at 17:00, Nikolaos Chrysanthidis wrote:
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Hi NEST users,
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I have a pre- and post-synaptic spike train and I want to impose these spike trains onto a plastic synapse to see the weight development.
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To this end, I thought of having 2 "parrot_neuron_ps" as pre- and post-synaptic neurons connected with the plastic synapse which uses AMPA receptor.
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By doing this, NEST yields the following error: "NESTError: UnknownReceptorType in Connect_g_g_D_D: Receptor type 1 is not available in parrot_neuron_ps." which in my case Receptor type 1 is the AMPA receptor.
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At the nest documentation about "parrot_neuron_ps" I found out that I can have the plastic synapse onto port 1 of the postsynaptic parrot neuron
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which I hope it will solve the error with the receptor.
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From nest documentation -> "Only spikes arriving on connections to port 0 will be repeated. Connections onto port 1 will be accepted, but spikes incoming
through port 1 will be ignored. This allows setting exact pre- and post-synaptic spike times for STDP protocols by connecting
two parrot neurons spiking at desired times by, e.g., a stdp_synapse onto port 1 on the post-synaptic parrot neuron."
My query is, how to connect the 2 neurons using port 1 of the post synaptic neuron ?
If this approach with parrot neurons doesn't seem the right choice, what is the most commonly used approach ?
Thank you very much,
Kind regards,
Nikolas
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