Hi Freesurfers,
I have tried looking this up on the list, but I don't understand exactly what to do in this scenario: I have a group of subjects (all controls). I want to create a surface map of the standard deviations of the thickness values (i.e. to show how the thicknesses vary across subjects). I am not sure what is the easiest way to go about this - can I:
1) simply convert the ?h.thickness files to .asc and calculate the deviations at each vertex (I am under the impression that this is not correct as they need to be registered to a common surface first), then convert back to .thickness and load into tksurfer
2) use mris_preproc then mris_glmfit? I don't necessarily want to calculate any stats, but I wouldn't mind a pretty picture :)
If I have 4 groups of 10 subjects each, so if I churn these all through glm_fit will I be able to access separate thickness files for each group? And how can I map standard deviations for each group in this scenario?
Many thanks,
Rysia