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Hi FreeSurfer experts,

I have recently been wondering about the correct unit for curvature and local gyrification index.

For curvature I find inconsistent information like: mm^-2 (https://onlinelibrary.wiley.com/doi/epdf/10.1002/ima.20138, page 47), but also that curvature values are expressed in degrees (https://www.sciencedirect.com/science/article/pii/S1053811905006543, page 1125).

For local gyrification index these papers make it seem like there is just not unit: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5397412/#:~:text=A%20large%20GI.... https://www.jneurosci.org/content/jneuro/31/19/7174.full.pdf

Which are the correct units? Happy to get some expert input on this, thank you so much!

Best, Lea

------------------------------ Lea Backhausen Ph.D. Student (M.Sc. Psychology/Neuroscience)

Department of Child and Adolescent Psychiatry, Faculty of Medicine of the TU Dresden, Germany http://www.uniklinikum-dresden.dehttp://www.uniklinikum-dresden.de/