if it's total you want then just add the left and right. No weighting necessary.

cheers Bruce On Thu, 17 Dec 2015, Carme Uribe Codesal wrote:

​Thanks Bruce.

It's the surface area

2015-12-17 17:25 GMT+01:00 Bruce Fischl fischl@nmr.mgh.harvard.edu: Hi Carme

  what measure do you mean? If you wanted an average it would be:


  average_thick = ((nvertices_lh) * (lh_average_thick) +
  (nvertices_rh) *
  (rh_average_thick))
                  ------------------------------------------
                      nvertices_lh + nvertices_rh

  cheers
  Bruce


  On Thu, 17
  Dec 2015, Carme Uribe Codesal wrote:

  > Dear FreeSurfer users,
  >
  > I've been looking for an appropiate way to merge both
  hemispheres in the
  > Desikan parcellations but I can't find it in the list.
  >
  > Which formula do I need to use to consider, for example, the
  bilateral
  > posterior cingulate as an only measure (not lh and rh
  separated)?
  >
  > I'm not sure if I can just add them in a mean...
  >
  > Thank you very much for your help!
  >
  > Carme
  >
  >

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