# Reproducibility issue between brian2.5 and 2.7

**URL:** <https://brian.discourse.group/t/reproducibility-issue-between-brian2-5-and-2-7/1240>\
**Category:** Support\
**Tags:** synapses, reproducibility, custom-event\
**Created:** [19 June 2024 11:19 UTC](https://brian.discourse.group/t/reproducibility-issue-between-brian2-5-and-2-7/1240 "2024-06-19T11:19:11Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![mstimberg](https://yyz2.discourse-cdn.com/free1/user_avatar/brian.discourse.group/mstimberg/32/11_2.png) [@mstimberg](https://brian.discourse.group/u/mstimberg)\
**Post date:** [19 June 2024 11:56 UTC](https://brian.discourse.group/t/reproducibility-issue-between-brian2-5-and-2-7/1240/2 "2024-06-19T11:56:55Z")

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Hi @mreynes. Many thanks for this report, there might have been some inadvertent change in Brian that cause this. When I recently answered another question here on the forum, I stated that " In fact, the `on_event` dictionary should only refer to `pre` and `post`, i.e. you can only set one event type for all `pre` and one event type for all `post` pathways." ([How to activate synaptic pathways on custom events only? - #2 by mstimberg](https://brian.discourse.group/t/how-to-activate-synaptic-pathways-on-custom-events-only/1213/2)). I made this statement after looking at the code, but after having another look at the documentation ([Custom events — Brian 2 2.7.0 documentation](https://brian2.readthedocs.io/en/stable/advanced/custom_events.html#triggering-synaptic-pathways)), it actually seems as if providing custom pathway names should be supported. Since your code uses this feature, and you had it work with Brian 2.5, so it seems to have been broken in an update. I’ll have a closer look soon and keep you posted!

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