Asymmetric structural matrix

[Jeriffer Smith]

Dear TVBers,

    I have a question about structural connectivity. I've read many papers, some of them use asymmetric sc and some use symmetric one, and there are many different definition of weights matrix.

   So I wonder which kind of sc is best for simulation fitness? And how to get asymmetric sc? Would you please give me a simple formula? I'm so sorry for my poor unstanding of papers that it's difficult for me to handle it. Thanks for your time. Have a nice day!

Best Regards,

Jeriffer

[WOODMAN Michael]

hi

The symmetry of an SC depends on the source data.  When data is obtained from anatomical tracing it can be asymmetric because connectivity from node i to node j is different from j to i.  For diffusion weight imaging, there's no directionality, and therefore the matrix is symmetric.  The following paper goes over an example with both kinds

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5489253/

cheers,

Marmaduke

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[Jeriffer Smith]

Thanks so much, Marmaduke! It's so nice of you!