symmetrized percent change

M. Alejandra Infante, Ph.D. Postdoctoral Fellow UC San Diego Department of Psychiatry Adolescent Brain Cognitive Development (ABCD) Study

________________________________________ From: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] on behalf of Douglas N Greve [greve@nmr.mgh.harvard.edu] Sent: Tuesday, July 18, 2017 12:58 PM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] SPC in surface area

sorry, what is SPC?

On 07/14/2017 02:15 PM, Maria A Infante wrote:

Hi everyone,

I have a questions concerning the SPC values for an individual brain region. I am looking at group differences (3 groups) in SPC in surface and found one region that was significant after correcting for multiple comparisons. I want to follow up with pairwise comparisons. Is there a way to extract the SPC values for that particular region? Are these the same values as the ones on the stack file?

Thanks,

Alejandra

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What is the unit of the spc, which you extract?

Fx. in my data I have a -0.49 = does that mean a -0.49 % decrease?

BW Kasper

Fra: freesurfer-bounces@nmr.mgh.harvard.edu [mailto:freesurfer-bounces@nmr.mgh.harvard.edu] På vegne af Martin Reuter Sendt: 19. juli 2017 11:37 Til: Freesurfer support list Emne: Re: [Freesurfer] SPC in surface area

Hi Alejandra,

the script creates an SPC stack, where you have all the SPC values for each vertex for each subject. Even in without the stack the SPC values are stored in each base directory. There are probably ways to define a label based on your ROI, then you can do an ROI analysis on the SPC files in all bases instead of a standard thickness analysis.

Best, Martin

On 14. Jul 2017, at 20:15, Maria A Infante <minfante@ucsd.edumailto:minfante@ucsd.edu> wrote:

Hi everyone,

I have a questions concerning the SPC values for an individual brain region. I am looking at group differences (3 groups) in SPC in surface and found one region that was significant after correcting for multiple comparisons. I want to follow up with pairwise comparisons. Is there a way to extract the SPC values for that particular region? Are these the same values as the ones on the stack file?

Thanks,

Alejandra

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