Dear Abolfazl, With current master it is possible to use the index of the neuron in a mathematical expression when specifying the rate (see our documentation on parametrization<https://nest-simulator.readthedocs.io/en/latest/guides/nest2_to_nest3/nest2_to_nest3_overview.html#parametrization>). It is currently not possible to include the current time `t` however. Using parametrization to get the rate to depend on the global id is not straight forward however, because you will need to create one poisson generator per neuron, each with a rate depending on the individual neuron. Another problem is that nest.poisson_generator does not accept negative rates. And, as it is not possible to use the current time, you would be better off creating a new poisson model where you can define your rate. The best way to do so it to use NESTML (https://nestml.readthedocs.io/en/latest/). Both the index id and current time should be available on this level. I have added our NESTML expert Charl in CC. Best wishes, Stine ________________________________ Fra: Abolfazl Ziaeemehr &lt;a.ziaeemehr(a)gmail.com&gt; Sendt: lørdag 26. desember 2020 12:16 Til: NEST User Mailing List &lt;users(a)nest-simulator.org&gt; Emne: [NEST Users] spatiotemporal Poisson generator Hello everyone, Is it possible to include a spatiotemporal poisson generator in the simulation? I am trying to apply a current to a population of neurons which is something like this? [Selection_001.png] where `i` is the index of the neuron and `t` is the current time of the simulation. Thank you for any guidance. best, -- Abolfazl Ziaeemehr PhD in Computational Neuroscience Institute for Advanced Studies in Basic Sciences (IASBS) Page: iasbs.ac.ir/~a.ziaeemehr<http://iasbs.ac.ir/~a.ziaeemehr> https://github.com/Ziaeemehr