# Latest **URL:** https://brian.discourse.group/latest.md [Latest](https://brian.discourse.group/latest.md) · [Categories](https://brian.discourse.group/categories.md) · [Tags](https://brian.discourse.group/tags.md) --- ## [Welcome to the Brian simulator community](https://brian.discourse.group/t/welcome-to-the-brian-simulator-community/7)
**Author:** [@system](https://brian.discourse.group/u/system)\ **Replies:** 0\ **Last updated:** [13 August 2020 11:56 UTC](https://brian.discourse.group/t/welcome-to-the-brian-simulator-community/7 "2020-08-13T11:56:54Z")
Welcome to the Brian simulator community. Here you can ask and get answers to your questions, answer other people’s questions, suggest new features or discuss with the developers. --- ## [ValueError: Equations of type 'parameter' cannot have a flag 'linked', only the following flags are allowed: \['constant', 'shared'\]](https://brian.discourse.group/t/valueerror-equations-of-type-parameter-cannot-have-a-flag-linked-only-the-following-flags-are-allowed-constant-shared/1373)
**Author:** [@paulbrodersen](https://brian.discourse.group/u/paulbrodersen)\ **Replies:** 8\ **Last updated:** [7 September 2026 12:42 UTC](https://brian.discourse.group/t/valueerror-equations-of-type-parameter-cannot-have-a-flag-linked-only-the-following-flags-are-allowed-constant-shared/1373 "2026-09-07T12:42:46Z")
Description of problem I am trying to implement the homeostatic inhibitory STDP rule used in Zenke (2015) in Brian2. The rule uses a symmetric STDP kernel that is modulated in size and sign by a global factor G, which c… --- ## [GSoC2026:Fix outstanding issues in Brian2CUDA](https://brian.discourse.group/t/gsoc2026-fix-outstanding-issues-in-brian2cuda/1560)
**Author:** [@SinYita](https://brian.discourse.group/u/SinYita)\ **Replies:** 4\ **Last updated:** [4 September 2026 18:03 UTC](https://brian.discourse.group/t/gsoc2026-fix-outstanding-issues-in-brian2cuda/1560 "2026-09-04T18:03:47Z")
Hi everyone :waving\_hand: ! I am Weiyuan Du, and I am excited to have been selected for this year’s GSoC with the Brian team ! This summer, I will working on resolving outstanding issues in Brian2CUDA. I am honored to b… --- ## [Introduce yourself 👋](https://brian.discourse.group/t/introduce-yourself/26)
**Author:** [@mstimberg](https://brian.discourse.group/u/mstimberg)\ **Replies:** 41\ **Last updated:** [21 August 2026 14:17 UTC](https://brian.discourse.group/t/introduce-yourself/26 "2026-08-21T14:17:20Z")
Hi everyone, to get to know each other a bit, feel free to reply to this topic and introduce yourself! Please share whatever you are comfortable with. It could be a simple hi, some details about you, about your work, o… --- ## [Interested in GSoC 2026: Package Brian’s unit system (175/350 h)](https://brian.discourse.group/t/interested-in-gsoc-2026-package-brian-s-unit-system-175-350-h/1532)
**Author:** [@gsocsid123](https://brian.discourse.group/u/gsocsid123)\ **Replies:** 4\ **Last updated:** [6 August 2026 09:09 UTC](https://brian.discourse.group/t/interested-in-gsoc-2026-package-brian-s-unit-system-175-350-h/1532 "2026-08-06T09:09:08Z")
Hi Brian Simulator Team, My name is Siddhant, and I am a software engineering student very interested in the project to package Brian’s unit system as a standalone library for GSoC 2026. I have been exploring brian2/un… --- ## [GSoC 2025 - Brian2Wasm: simulations in the browser](https://brian.discourse.group/t/gsoc-2025-brian2wasm-simulations-in-the-browser/1452)
**Author:** [@PalashChitnavis](https://brian.discourse.group/u/PalashChitnavis)\ **Replies:** 5\ **Last updated:** [2 August 2026 11:04 UTC](https://brian.discourse.group/t/gsoc-2025-brian2wasm-simulations-in-the-browser/1452 "2026-08-02T11:04:30Z")
Hey everyone! I’m Palash Chitnavis, a GSoC 2025 contributor. This summer, I’ll be working on Project #7 Brian Simulator :: Brian2Wasm: simulations in the browser (175/350h). I’m really looking forward to working with my… --- ## [Replicating "Rapid thalamocortical network switching mediated by cortical synchronization..." by Soplata et al. (2023) in Brian2](https://brian.discourse.group/t/replicating-rapid-thalamocortical-network-switching-mediated-by-cortical-synchronization-by-soplata-et-al-2023-in-brian2/1304)
**Author:** [@Volcanic\_Neuron](https://brian.discourse.group/u/Volcanic_Neuron)\ **Replies:** 15\ **Last updated:** [24 July 2026 19:32 UTC](https://brian.discourse.group/t/replicating-rapid-thalamocortical-network-switching-mediated-by-cortical-synchronization-by-soplata-et-al-2023-in-brian2/1304 "2026-07-24T19:32:50Z")
Hello Brian2 community, I am trying to implement a thalamocortical model for propofol induced anesthesia from this paper, " Rapid thalamocortical network switching mediated by cortical synchronization underlies propofol… --- ## [NeuronGroup Class can i use rk4 like this](https://brian.discourse.group/t/neurongroup-class-can-i-use-rk4-like-this/1564)
**Author:** [@KotsiosKotsiou](https://brian.discourse.group/u/KotsiosKotsiou)\ **Replies:** 1\ **Last updated:** [16 July 2026 15:15 UTC](https://brian.discourse.group/t/neurongroup-class-can-i-use-rk4-like-this/1564 "2026-07-16T15:15:26Z")
Description of problem Minimal code to reproduce problem can i use the class with rk4 like this P = NeuronGroup(1, model=eqs, threshold=‘v\>-20\*mV’,refractory=3\*ms, method=rk4) --- ## [Showcase: A multiphysics, multiscale, and multidisciplinary study using LAMMPS for the intestinal transport](https://brian.discourse.group/t/showcase-a-multiphysics-multiscale-and-multidisciplinary-study-using-lammps-for-the-intestinal-transport/1561)
**Author:** [@Jasmine9691](https://brian.discourse.group/u/Jasmine9691)\ **Replies:** 0\ **Last updated:** [10 June 2026 05:37 UTC](https://brian.discourse.group/t/showcase-a-multiphysics-multiscale-and-multidisciplinary-study-using-lammps-for-the-intestinal-transport/1561 "2026-06-10T05:37:25Z")
Dear Brian2 developers and users: I am glad to announce that my newest study using LAMMPS has been published on Journal of The Royal Society Interface: https://royalsocietypublishing.org/rsif/article/23/239/20251155/482… --- ## [Memory error insufficient disc space](https://brian.discourse.group/t/memory-error-insufficient-disc-space/1471)
**Author:** [@MitchG\_HunterCollege](https://brian.discourse.group/u/MitchG_HunterCollege)\ **Replies:** 8\ **Last updated:** [6 June 2026 14:40 UTC](https://brian.discourse.group/t/memory-error-insufficient-disc-space/1471 "2026-06-06T14:40:04Z")
I am using a PC laptop with ~200 GB free space for running network simulations, and I am encountering a memory limitation problem. The model of 2000 PYR neurons and 20 PVN neurons will successfully run for 5 seconds wit… --- ## [GSoC 2026 Interest: Modernizing Brian2 Serialization with HDF5 and Apache Fury](https://brian.discourse.group/t/gsoc-2026-interest-modernizing-brian2-serialization-with-hdf5-and-apache-fury/1554)
**Author:** [@gsocsid123](https://brian.discourse.group/u/gsocsid123)\ **Replies:** 0\ **Last updated:** [16 March 2026 12:57 UTC](https://brian.discourse.group/t/gsoc-2026-interest-modernizing-brian2-serialization-with-hdf5-and-apache-fury/1554 "2026-03-16T12:57:15Z")
Hi Marcel and the Brian2 Team, I am Siddhant, a CSE student and open-source developer. I am writing to express my strong interest in the Serialization/Deserialization for Brian models project for GSoC 2026. After resea… --- ## [Interested in infra project in GSoC 2026](https://brian.discourse.group/t/interested-in-infra-project-in-gsoc-2026/1552)
**Author:** [@xBelisarius](https://brian.discourse.group/u/xBelisarius)\ **Replies:** 0\ **Last updated:** [10 March 2026 15:00 UTC](https://brian.discourse.group/t/interested-in-infra-project-in-gsoc-2026/1552 "2026-03-10T15:00:58Z")
Hello! Quite interested in gathering feedback on the vision for the infra project recently posted by INCF in 2026 “2) Brian Simulator - Update Brian documentation infrastructure” I already contacted @mstimberg through … --- ## [Neuronal damage](https://brian.discourse.group/t/neuronal-damage/1550)
**Author:** [@flyinglighs52750](https://brian.discourse.group/u/flyinglighs52750)\ **Replies:** 0\ **Last updated:** [8 March 2026 08:26 UTC](https://brian.discourse.group/t/neuronal-damage/1550 "2026-03-08T08:26:53Z")
How to introduce strain damage to a neural network? Is it by fixing the conductance of certain ion channels to inactivate them? --- ## [Best ways for comparrison between Brian2 and other SNN sims](https://brian.discourse.group/t/best-ways-for-comparrison-between-brian2-and-other-snn-sims/1539)
**Author:** [@xBelisarius](https://brian.discourse.group/u/xBelisarius)\ **Replies:** 0\ **Last updated:** [1 March 2026 09:26 UTC](https://brian.discourse.group/t/best-ways-for-comparrison-between-brian2-and-other-snn-sims/1539 "2026-03-01T09:26:17Z")
Hello guys I began thinking about how neural models could be used in a cybernetic context, specifically in economic processes. I wrote a Medium post regarding this and i wish to pursue it as a side project. If anyone i… --- ## [Inquiry regarding GSoC Project: Fix outstanding issues in Brian2CUDA](https://brian.discourse.group/t/inquiry-regarding-gsoc-project-fix-outstanding-issues-in-brian2cuda/1537)
**Author:** [@HengyeZhu](https://brian.discourse.group/u/HengyeZhu)\ **Replies:** 0\ **Last updated:** [28 February 2026 12:19 UTC](https://brian.discourse.group/t/inquiry-regarding-gsoc-project-fix-outstanding-issues-in-brian2cuda/1537 "2026-02-28T12:19:42Z")
Hi Brian Simulator Team, I am Hengye Zhu, an undergraduate student interested in High-Performance Computing for Computational Neuroscience. First of all, thank you so much for your work. Brian2 was the first simulator … --- ## [Should a computer with faster processor execute simulation faster?](https://brian.discourse.group/t/should-a-computer-with-faster-processor-execute-simulation-faster/1531)
**Author:** [@MitchG\_HunterCollege](https://brian.discourse.group/u/MitchG_HunterCollege)\ **Replies:** 1\ **Last updated:** [23 February 2026 16:36 UTC](https://brian.discourse.group/t/should-a-computer-with-faster-processor-execute-simulation-faster/1531 "2026-02-23T16:36:43Z")
12-second simulation of my neural network on my HP laptop with 1.7GHz processor had taken ~28min to execute. Thinking that a “faster” computer would perform better, I have tried buying another HP laptop with purported 5… --- ## [Symbolic ODE extractor - Creating a brian2 tool](https://brian.discourse.group/t/symbolic-ode-extractor-creating-a-brian2-tool/1527)
**Author:** [@BernardM](https://brian.discourse.group/u/BernardM)\ **Replies:** 0\ **Last updated:** [10 February 2026 16:58 UTC](https://brian.discourse.group/t/symbolic-ode-extractor-creating-a-brian2-tool/1527 "2026-02-10T16:58:47Z")
Hi everyone, I’m sharing a small prototype tool: it recursively reconstructs a symbolic ODE from a Brian2 network and returns fully-expanded SymPy expressions for a designated variable (including dependencies across gro… --- ## [Implemented of Wacongne et al. 2012 with using Brian2, wanna contrubute to the Brian documentation](https://brian.discourse.group/t/implemented-of-wacongne-et-al-2012-with-using-brian2-wanna-contrubute-to-the-brian-documentation/1526)
**Author:** [@cagataydisli](https://brian.discourse.group/u/cagataydisli)\ **Replies:** 0\ **Last updated:** [7 February 2026 19:35 UTC](https://brian.discourse.group/t/implemented-of-wacongne-et-al-2012-with-using-brian2-wanna-contrubute-to-the-brian-documentation/1526 "2026-02-07T19:35:05Z")
Hi, We have implemented Wacongne et al. (2012) paper with using Brian2. We thought we could contribute to the brian2 documentation by adding this to the examples/from\_papers section. We have allready made pull-request … --- ## [Non-standalone restoring states from saved states of standalone mode](https://brian.discourse.group/t/non-standalone-restoring-states-from-saved-states-of-standalone-mode/1523)
**Author:** [@Shreshthallbestno1](https://brian.discourse.group/u/Shreshthallbestno1)\ **Replies:** 4\ **Last updated:** [2 February 2026 23:27 UTC](https://brian.discourse.group/t/non-standalone-restoring-states-from-saved-states-of-standalone-mode/1523 "2026-02-02T23:27:29Z")
Description of problem One cannot use store() or restore() in the standalone modes. I want to restore the saved states from standalone mode in a cython initiation of network, for quick runs/ testing and not necessarily l… --- ## [Give feedback: the future of Brian](https://brian.discourse.group/t/give-feedback-the-future-of-brian/1521)
**Author:** [@mstimberg](https://brian.discourse.group/u/mstimberg)\ **Replies:** 5\ **Last updated:** [2 February 2026 12:43 UTC](https://brian.discourse.group/t/give-feedback-the-future-of-brian/1521 "2026-02-02T12:43:06Z")
Hi everyone, and happy 2026! :fireworks: We’d like to gather feedback from the Brian user community about what your ideal Brian simulator of the future would look like. What features, functionality, documentation, or tra… --- ## [New release (2.10), new settings, and a request for feedback](https://brian.discourse.group/t/new-release-2-10-new-settings-and-a-request-for-feedback/1522)
**Author:** [@mstimberg](https://brian.discourse.group/u/mstimberg)\ **Replies:** 0\ **Last updated:** [16 January 2026 15:28 UTC](https://brian.discourse.group/t/new-release-2-10-new-settings-and-a-request-for-feedback/1522 "2026-01-16T15:28:20Z")
This announcement comes a bit late, but in case you were not aware of it: about a month ago we released Brian 2.10 :rocket: This release comes with plenty of bug fixes, packages for Python 3.14, and a few new features su… --- ## [Trouble Making Synapse with AMPA and NMDA receptors](https://brian.discourse.group/t/trouble-making-synapse-with-ampa-and-nmda-receptors/1520)
**Author:** [@MitchG\_HunterCollege](https://brian.discourse.group/u/MitchG_HunterCollege)\ **Replies:** 2\ **Last updated:** [13 January 2026 15:35 UTC](https://brian.discourse.group/t/trouble-making-synapse-with-ampa-and-nmda-receptors/1520 "2026-01-13T15:35:31Z")
Description of problem I am working with coding for an excitatory AMPAR-like synapses (see AMPA synapse and target neuron eqs below). It works fine. I also generated an excitatory NMDAR-like synapses (see NMDA synapse … --- ## [Long compiling time for a complex network](https://brian.discourse.group/t/long-compiling-time-for-a-complex-network/1516)
**Author:** [@sivanni](https://brian.discourse.group/u/sivanni)\ **Replies:** 2\ **Last updated:** [11 December 2025 19:54 UTC](https://brian.discourse.group/t/long-compiling-time-for-a-complex-network/1516 "2025-12-11T19:54:29Z")
First, cordial thanks for updating the brian2cuda to use latest brian2! Description of problem We are going after plasticity in multi-object network, and were hit apparently by brian2cuda slow compiling time. This issue… --- ## [Change the input and update weigths between runs](https://brian.discourse.group/t/change-the-input-and-update-weigths-between-runs/1509)
**Author:** [@dmytr0](https://brian.discourse.group/u/dmytr0)\ **Replies:** 11\ **Last updated:** [27 November 2025 14:44 UTC](https://brian.discourse.group/t/change-the-input-and-update-weigths-between-runs/1509 "2025-11-27T14:44:14Z")
Description of problem I created spiking neural network and i have train dataLoader from which i want to take input for my network. Also after run i wnat to update weights offline and run next example with updated weight… --- ## [\[GSoC 2026 Interest\] Profiling Synapse Compilation & Backend Optimization](https://brian.discourse.group/t/gsoc-2026-interest-profiling-synapse-compilation-backend-optimization/1512)
**Author:** [@ayush4874](https://brian.discourse.group/u/ayush4874)\ **Replies:** 1\ **Last updated:** [26 November 2025 13:40 UTC](https://brian.discourse.group/t/gsoc-2026-interest-profiling-synapse-compilation-backend-optimization/1512 "2025-11-26T13:40:54Z")
Hi Brian Community, My name is Ayush, and I am a researcher working on Physics-Constrained Neural Networks and Spiking Dynamics. I have been following Brian2’s development and am interested in contributing to the C++/Cy… --- ## [Self-Sustaining Memory in Brian2: 10k Neurons with Strong Recurrent Feedback & Active-Set Optimization](https://brian.discourse.group/t/self-sustaining-memory-in-brian2-10k-neurons-with-strong-recurrent-feedback-active-set-optimization/1510)
**Author:** [@Peace](https://brian.discourse.group/u/Peace)\ **Replies:** 0\ **Last updated:** [23 November 2025 23:02 UTC](https://brian.discourse.group/t/self-sustaining-memory-in-brian2-10k-neurons-with-strong-recurrent-feedback-active-set-optimization/1510 "2025-11-23T23:02:39Z")
Hi everyone, I wanted to share some results from a recent project where I’ve been pushing the limits of Brian2 for large-scale, continuous-time simulations. My goal was to create a Spiking Neural Network that could han… --- ## [Saving and restoring in cpp\_standalone with multiple runs](https://brian.discourse.group/t/saving-and-restoring-in-cpp-standalone-with-multiple-runs/1506)
**Author:** [@ccluri](https://brian.discourse.group/u/ccluri)\ **Replies:** 3\ **Last updated:** [19 November 2025 18:26 UTC](https://brian.discourse.group/t/saving-and-restoring-in-cpp-standalone-with-multiple-runs/1506 "2025-11-19T18:26:21Z")
Description of problem Thank you for Brian2 and for your support. I have to store and restore my simulations starting from 10k seconds. The C++ code is substantially faster for me, and I would like to use it instead of … --- ## [Project compilation failed (error code: 2)](https://brian.discourse.group/t/project-compilation-failed-error-code-2/1507)
**Author:** [@danielmk](https://brian.discourse.group/u/danielmk)\ **Replies:** 4\ **Last updated:** [16 November 2025 02:57 UTC](https://brian.discourse.group/t/project-compilation-failed-error-code-2/1507 "2025-11-16T02:57:14Z")
Description of problem My cpp\_standalone compilation capabilities broke. Not sure what I did to break it. Maybe it was the Windows11 update? I get the error RuntimeError: Project compilation failed (error code: 2), consi… --- ## [Default test " brian2cuda.example\_run()" throws error after installation?](https://brian.discourse.group/t/default-test-brian2cuda-example-run-throws-error-after-installation/1504)
**Author:** [@alexyz](https://brian.discourse.group/u/alexyz)\ **Replies:** 2\ **Last updated:** [3 November 2025 10:15 UTC](https://brian.discourse.group/t/default-test-brian2cuda-example-run-throws-error-after-installation/1504 "2025-11-03T10:15:23Z")
Description of problem I’m trying to install Brian2CUDA as mentioned in Installation — Brian2CUDA 1.0.0 documentation , but the default installation throws an error on my Ubuntu WSL on Windows 11, and I can’t get even a … --- ## [Is there a way to update (summed) variables only on events?](https://brian.discourse.group/t/is-there-a-way-to-update-summed-variables-only-on-events/1503)
**Author:** [@kjohnsen](https://brian.discourse.group/u/kjohnsen)\ **Replies:** 2\ **Last updated:** [31 October 2025 11:45 UTC](https://brian.discourse.group/t/is-there-a-way-to-update-summed-variables-only-on-events/1503 "2025-10-31T11:45:13Z")
I have expensive summed variable code running on synapses that I only need at spike time. I’ve tried leaving the variable undefined in model and updating it in pre, but I get \`ValueError: Equations of type 'parameter' c… [Next page](https://brian.discourse.group/latest.md?page=1)