# \#plasticity

**URL:** https://brian.discourse.group/tag/plasticity/37.md

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## [Change the neurons indices and firing times in SpikeGeneratorGroup?](https://brian.discourse.group/t/change-the-neurons-indices-and-firing-times-in-spikegeneratorgroup/1478)

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**Author:** [@Abidalrekab](https://brian.discourse.group/u/Abidalrekab)\
**Replies:** 1\
**Last updated:** [28 July 2025 09:34 UTC](https://brian.discourse.group/t/change-the-neurons-indices-and-firing-times-in-spikegeneratorgroup/1478 "2025-07-28T09:34:04Z")

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Description of problem I’m trying to make the neuronal population fire according to precomputed sequences of firing. An encoding scheme produces those firing sequences. For instance, let’s assume i have 100 neurons at …

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## [Delay Plasticity Only Working in One Direction](https://brian.discourse.group/t/delay-plasticity-only-working-in-one-direction/1301)

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**Author:** [@butlerK](https://brian.discourse.group/u/butlerK)\
**Replies:** 3\
**Last updated:** [17 October 2024 14:14 UTC](https://brian.discourse.group/t/delay-plasticity-only-working-in-one-direction/1301 "2024-10-17T14:14:47Z")

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Description of problem I’m working on a synapse model to adjust synaptic delays in the same way that STDP would adjust synaptic weights. It appeared to be working, since synaptic delays were changing, but on further insp…

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## [How to fix the value of a synapse after learning](https://brian.discourse.group/t/how-to-fix-the-value-of-a-synapse-after-learning/889)

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**Author:** [@caccola816](https://brian.discourse.group/u/caccola816)\
**Replies:** 2\
**Last updated:** [30 January 2023 17:28 UTC](https://brian.discourse.group/t/how-to-fix-the-value-of-a-synapse-after-learning/889 "2023-01-30T17:28:18Z")

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Description of problem Hello! I’m trying to use spiking neural network to learn MNIST dataset. I defined a STDP synapse with a variable ‘learned’ that it should be set equal to 0 after learning, so that the weights that …