Hi Joost,

we provide both so you can have the flexibility to do what you want with them. The naming conventions are for historical reasons (we had a white matter representation before we had a pial one).

cheers Bruce

On Thu, 29 Apr 2010, j janssen wrote:

Hi,

what's the reason that FS's default surface for measuring surface area is the white matter surface and not the pial surface? why isn't surface area measured on the intermediate surface (average of gray.and white which should be less biased by sulci and gyri, i think)?

thanks, -joost

...

...

On Wed, Apr 28, 2010 at 5:48 PM, Michael Harms mharms@conte.wustl.edu wrote:

    Hi Massieh,
    There were some posts related to this a while back.
    If I recall correctly, the vertex-wise area measure (and
    likewise the
    vertex-wise volume measure) is highly dependent on the local
    mesh
    triangulation, and thus is not really a meaningful variable
    from a
    biological perspective.  So, you would be better off analyzing
    the area
    of a whole label.

    Best,
    -Mike H.



    On Wed, 2010-04-28 at 09:54 -0400, Massieh Moayedi wrote:
   > Hi everyone,
   >
   > I had two questions:
   >
   > 1) I was wondering if it's ok to run a glm to compare
    cortical surface
   > areas between two groups on a vertex-wide basis (just like a
    thickness
   > analysis).  Or is it better to extract the area of a label
    (as is the
   > output of mri_anatomical_stats)?
   >
   > 2) The mri_anatomical_stats output includes 4 measures of
    curvature:
   > MeanCurv, GausCurv, Van Essen Folding index and Curvature
    Index.  There
   > was some discussion as to which of these was most
    appropriate for
   > comparing sulcal folding (that is, essentially what they
    measure,
   > correct?)- was there ever any final consensus?
   >
   > Thank you.
   >
   > Regards,
   >
   > Massieh Moayedi B.Sc. (Hons)
   > PhD Student
   > Dr. Karen Davis' Lab
   > Institute of Medical Science
   > University of Toronto
   >
   > Brain, Imaging and Behaviour- Systems Neuroscience
   > MP 14-301
   > Toronto Western Research Institute
   > University Health Network
   > 399 Bathurst Street
   > Toronto, Ontario
   > Canada M5T 2S8
   > Tel: 416-603-5882
   >
   > massih.moayedi@utoronto.ca
   > mmoayedi@uhnres.utoronto.ca
   > http://individual.utoronto.ca/PSMJC
   >
   >
   >
   > _______________________________________________
   > Freesurfer mailing list
   > Freesurfer@nmr.mgh.harvard.edu
   > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
   >
   >
   > The information in this e-mail is intended only for the
    person to whom it is
   > addressed. If you believe this e-mail was sent to you in
    error and the e-mail
   > contains patient information, please contact the Partners
    Compliance HelpLine at
   > http://www.partners.org/complianceline . If the e-mail was
    sent to you in error
   > but does not contain patient information, please contact the
    sender and properly
   > dispose of the e-mail.

    _______________________________________________
    Freesurfer mailing list
    Freesurfer@nmr.mgh.harvard.edu
    https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer