distance and weights units

[Alberto Vergani]

Dear collegues,

I was looking the PyNN page (http://neuralensemble.org/docs/PyNN/units.html) related to the units adopted in the software and realized that units of weights and distance are not indicated.

I went through the PyNN paper (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2634533/) and found out that weights are in microsiemens.

Instead, the distance unit was not indicated.

Any suggestions about the distance unit? (nanometer, micrometer, millimeter).

Thanks,

Alberto

[Andrew Davison]

Dear Alberto,

Thanks for pointing out the oversight. This information can be found in the docs (http://neuralensemble.org/docs/PyNN/connections.html), but it would make sense to also have it on the units page. I will update this.

To answer your question, weights are in microsiemens or nanoamps, depending on whether the post-synaptic mechanism implements a change in conductance or current.

Distances are typically in microns, but any distance scale can be used, provided it is used consistently.

Regards,

Andrew

[Alberto]

Dear Andrew,

Thanks for the link and the answer.

Regards,

Alberto

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Vergani, AA