Hi, Thank you for writing in. The neuron model having a calcium concentration is something of a fluke, as it was originally introduced only as a component in simulating structural plasticity. Therefore, I would recommend using this calcium value only if you are not otherwise planning to use structural plasticity mechanisms. I have created a pull request that makes the calcium concentration available for setting: https://github.com/nest/nest-simulator/pull/2627 as it seems like this should anyway exist as a feature. Please let me know if this works for you. In the ideal case we would not use the calcium concentration from the structural plasticity part of NEST, but track the concentration as part of the neuron model itself (e.g. in models/iaf_psc....cpp,h). NESTML is a modelling language for NEST that was created to allow you to easily express custom neuron (and synaptic) dynamics, and to generate code for it and build an extension module for NEST. Please see here for writing your neuron model in NESTML: https://nestml.readthedocs.org/ Yours, Charl On Mon, Mar 6, 2023, at 21:45, Abbey Durell wrote:

Great to hear! I'm not sure what exactly you mean by changing the connection rules, could you elaborate? Perhaps a new thread for that would make the most sense. Cheers, Charl On Sat, Mar 18, 2023, at 22:40, Abbey Durell wrote:

Hi Abbey, This is an open issue (stale). As far as I am aware, the solution hasn't been merged with the latest issue. Check it out here: https://github.com/nest/nest-simulator/issues/2212 In my work, I have been using NEST v2.20.2 as a temporary workaround---where it is quite straight forward. Depending upon how urgently you need to control autapses and multapses you can choose to use Sandra's test branch (https://github.com/nest/nest-simulator/issues/2212#issuecomment-1178877744) or use NEST v2.20.x. Best, Ady On 3/28/23 2:46 AM, "Abbey Durell" <durell_abbey(a)wheatoncollege.edu> wrote: