Hi Shay,

not necessarily. It depends what your goal is. --projfrac 0 for example will minimize the chances of an activation spreading across the banks of a sulcus.

cheers Bruce On Sun, 3 Jun 2012, Shay Ohayon wrote:

Dear Bruce, I see, so you would recommend to use it with "--projfrac 0.5". Thanks for your help.

-- Shay

On Sat, Jun 2, 2012 at 7:19 PM, Bruce Fischl fischl@nmr.mgh.harvard.edu wrote: Hi shay Are you using mri_vol2surf to sample it onto the surface before displaying in tksurfer? If so, you get to choose how to sample and interpolate?

  Cheers
  Bruce



  On Jun 2, 2012, at 9:43 PM, Shay Ohayon <shay.ohayon@gmail.com> wrote:

  > Hi,
  >
  > I have another silly question. When a functional overlay (say, log p-value map) is loaded
  to tksurfer, how exactly are the surface vertex values computed? using simple interpolation
  of the loaded map? or is it something
  > more fancier, like looking along the normal of each surface face and taking the
  maximum/minimum?
  > The reason I'm asking is because if surface vertices are interpolated exactly using the
  loaded volume, they don't fall on gray matter (right? either I use the white matter surface
  or the pial surface, where activation should be in between...)
  >
  > Thanks in advance,
  >
  > Shay
  > Tsao Lab
  > Caltech
  >
  >

...

---

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