[NEST Users] [stdp_dopamine] Different concentrations for different number of threads

Hi everyone,

I'm getting strangely different results if I use stdp_dopamine_synapse with more than 1 local thread. For instance, the mini-code bellow creates a connection with an initial non-zero DA concentration and at t=1000 ms a spike arrives at the volume transmitter. If I run it with one thread I get an initial decay on the DA concentration and then a bump at t=1000 ms. Which is the expected behavior. But if I run the same thing with 2 threads, then I get just the decay. As if the spike hasn't arrived at the volume transmitter. Is this the expected behavior or is it maybe a bug?

Best, Gui

[image: Screenshot from 2019-06-25 18-32-58.png] [image: 1thread.png]

[image: 2threads.png]