Dear FS Experts,
I want to measure the thickness difference between two groups, control and experimental group. And every subject scaned twice.
I look at the page: http://surfer.nmr.mgh.harvard.edu/fswiki/LongitudinalProcessing
and some reply in Mail-list.
I looked one method: Subtract time2 to time1 manually and do a regular GLM.
How to substract times? Maybe the results after the cmd are?
 "recon-all -base con* -tp con*_MR1 -tp con*_MR2 -all 
  recon-all -base sub* -tp sub*_MR1 -tp sub*_MR2 -all"

Can I do GLM between con* and sub* directly?
Could you please tell me how to do?

Many thanks!
Best regards,
Melody