[NEST Users] Issue with NEST 2.18.0/python 3.6

Hello, I have an issue regarding random generation in nest version 2.18 with Python3.6. I attach a small python script that replicates my issue (less than 50 lines). In short, I am trying to create two Poisson generators and connect them to the same neuron. I noticed that if I reverse the order by which these Poisson generators are created (using the nest.Create()) function, then I get a different membrane potential response over time. In the code, noise_exc is created before noise_inh. If that order is reversed, the plot is different. My hunch is that this has to do with how nest generates random numbers. So I tried to force the creation of Poisson generators by providing a seed (lines 15 and 18). However this behavior persists. Do you have any insights as to why this happens? At the end of the script (lines 32-43) I provide a trivial case of the desired behavior I am trying to replicate. Thank you for your time Angeliki -- [image: Kth Logo] Angeliki Papadimitriou Research EngineerKTH Royal Institute of Technology *School of Electrical Engineering and Computer Science (EECS)**Division of Computational Science and Technology (CST)* Computational Brain Science Unit Room 4438, Floor 4, Lindstedtsvägen 5 11428 Stockholm, Sweden angpap(a)kth.se <namn(a)kth.se>