Thank you, I have three follow up
questions:
Threshold is –log10(p), why are negative
values showing up on the display?
I am using fsaverage to display my
results, would it make any difference if I created my own average subject based
on the analysis?
Is it possible to export the
voxel-by-voxel intensities (or the brain surface data) used in
Freesurfer’s analysis; and then re-import the some external analysis
results back to Freesurfer format for display purposes?
Cole
From: freesurfer-bounces@nmr.mgh.harvard.edu
[mailto:freesurfer-bounces@nmr.mgh.harvard.edu] On Behalf Of Doug Greve
Sent: Monday, January 22, 2007
11:56 AM
To: Reschke, Cole
Cc:
Subject: Re: [Freesurfer]
interpret analysis results
The values are -log10(p), so p < .01 would require a threshold of 2, etc. I
don't use t, z, or F because I have not memorized the various tables that
convert them to p:). The sig will map to any surface, including pial.
doug
Reschke, Cole wrote:
Next, I have three questions. In my analysis, I
used the –paired-diff and –osgm options in mris_preproc and
mri_glmfit, respectively. I have successfully loaded sig.mgh onto the
inflated surface.
Are the values from the color chart [-5,5]
representative of a t-score or an F-score (t^2)?
I adjust the threshold by changing the
‘Min’ value in the ‘Configure Overlay Display’?
Ex. If Min ==3, then p < 0.001 ?
Is the sig.mgh created solely for the inflated
surface, or is it able to be uploaded on others (pial, wm, etc.)?
Thank you,
Cole
Cole Reschke
Data Manager,
Banner Alzheimer
Institute
Phone: (602) 239-4868
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-- Douglas N. Greve, Ph.D.