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 <fis...@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.oha...@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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