Hi Maryada,

If you have a predetermined current that you want to inject, you can use step_current_generator. This should work well if you have only a limited number of injected currents as suggested by your figure. If you want to inject a very large number of currents, we would need to take another look, since step_current_generator is replicated on all threads, which can cause scaling problems.

If you just want noisy currents, you have the noise_generator for Gaussian noise. If you wanted noise with some amplitude profile (waxing and waning as in the orange and green curves in your plot), one could probably extend noise_generator to modify the noise amplitude with time in similar ways as for the inhomogeneous_poisson_generator. I am not certain if NESTML already provides all that is need to do this or if one still would need to implement this on the C++ level.

Note that noise_generator provides stepwise constant noise with Gaussian-distributed values, not strictly white noise, and is thus dependent on the step size. For details, see

https://nest-simulator.readthedocs.io/en/stable/model_details/noise_generator.html

Best,

Hans Ekkehard

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Prof. Dr. Hans Ekkehard Plesser

Departmend Head

Department of Data Science

Faculty of Science and Technology

Norwegian University of Life Sciences

PO Box 5003, 1432 Aas, Norway

Phone +47 6723 1560

Email hans.ekkehard.plesser@nmbu.no

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From: Maryada Maryada <er.maryada@gmail.com>
Date: Thursday, 18 July 2024 at 14:48
To: NEST User Mailing List <users@nest-simulator.org>
Subject: [NEST Users] Inject analog signal in a neuron

Dear NEST Users,

Could anyone recommend the best way to inject a fluctuating current over time.

A sample signal

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Thanks and Regards

Maryada