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Summary of Snudda

Snudda creates the connectivity for realistic networks of simulated neurons in silico in a bottom up fashion that can then be simulated using the NEURON software. Neurons are placed within 3D meshes representing the structures of interest, with neural densities as seen in experiments. Based on reconstructed morphologies and neuron placement we can infer locations of putative synapses based on proximity between axon and dendrites. Projections between different structures can be added either using axon reconstructions, or by defining a connectivity map between regions. Putative synapses are pruned to match experimental pair-wise data on connectivity. Networks can be simulated either on desktop machines, or on super computers.

Contact details

Johannes Hjorth, Royal Institute of Technology (KTH) Human Brain Project [email protected]

Funding

Horizon 2020 Framework Programme (785907, HBP SGA2); Horizon 2020 Framework Programme (945539, HBP SGA3); Vetenskapsrådet (VR-M-2017-02806, VR-M-2020-01652); Swedish e-science Research Center (SeRC); KTH Digital Futures. The computations are enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) at PDC KTH partially funded by the Swedish Research Council through grant agreement no. 2018-05973. We acknowledge the use of Fenix Infrastructure resources, which are partially funded from the European Union's Horizon 2020 research and innovation programme through the ICEI project under the grant agreement No. 800858. Snudda is supported and featured on EBRAINS.

Citation

Please cite the first paper for the general Snudda network creation and simulation methods, and the second paper for the Striatal microcircutiry model.

  • Predicting Synaptic Connectivity for Large-Scale Microcircuit Simulations Using Snudda. J. J. Johannes Hjorth, Jeanette Hellgren Kotaleski, Alexander Kozlov. Neuroinform (2021). https://doi.org/10.1007/s12021-021-09531-w

  • The microcircuits of striatum in silico. J. J. Johannes Hjorth, Alexander Kozlov, Ilaria Carannante, Johanna Frost Nylén, Robert Lindroos, Yvonne Johansson, Anna Tokarska, Matthijs C. Dorst, Shreyas M. Suryanarayana, Gilad Silberberg, Jeanette Hellgren Kotaleski, Sten Grillner. Proceedings of the National Academy of Sciences (2020). https://doi.org/10.1073/pnas.2000671117

Installation

To install Snudda:

pip3 install snudda

For more information, see Github:

https://github.com/Hjorthmedh/Snudda/wiki/1.-User-installation

Jupyter Notebook examples

There are a number of examples for how to create and run networks on github which illustrates the functionality of Snudda. Several of these are created as short notebooks to showcase a particular feature or function.

https://github.com/Hjorthmedh/Snudda/tree/master/examples/notebooks

Command line examle

Once installed Snudda can also be run from the command line, using the snudda command. Below is a small list of the relevant commands that can be used.

Creates an a json config file:

snudda init <networkPath> --size XXX

Cell placement within volumes specified:

snudda place <networkPath>

Touch detection of putative synapses:

snudda detect <networkPath> [--hvsize hyperVoxelSize]

Prune the synapses

snudda prune <networkPath> [--mergeonly]

Setup the input, obs you need to manually pick a input config file

snudda input <networkPath> [--input yourInputConfig]

Run the network simulation using neuron

snudda simulate <networkPath>

Plot figurs with some network analysis:

snudda analyse <networkPath>

Show this help text

snudda help me

Additional information:

https://snudda.readthedocs.io/ https://snudda.readthedocs.io/en/dev