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Hi Doug,
Thank you. Makes sense. Is there any way to visualize significance overlays for
the subcortical volumes?
I've also moved on to the correction for multiple comparisons in my subcortical
volumes, using:
mri_glmfit-sim -- glmdir roi.binarygroup.glmdir --perm 1000 1.3 abs --cwp 0.05
--2spaces --bg 1
This did not create any new files in the Contrast subdirectories, but the log
file does say that it was run and finished. Can I find a table with corrected
p-values anywhere? Or would it make more sense to move the aseg_table into a
different stats package and calculate my GLM there, correcting for multiple
comparisons post-hoc (manually)?
Thank you so much
Julia
NIHR Maudsley Biomedical Research Centre PhD Student
Forensic & Neurodevelopmental Sciences
Institute of Psychiatry, Psychology & Neuroscience
King's College London
16 De Crespigny Park, Camberwell
London, SE5 8AB
From: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> On Behalf Of Douglas N. Greve
Sent: 15 April 2021 15:14
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] glmfit with aseg table: view surface overlay
The input is a table, so the output is a table (the sig.mgh file will just have
the number of values that are in the table; this is not a "volume" you can look
at in FV). Look in the sig.table.dat file for the sigs.
On 4/13/2021 8:41 AM, Griem, Julia wrote:
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Dear Freesurfer team,
I am comparing subcortical volumes (aseg table) in 2 groups with no other
variables. Based on the GLM lecture slides from the course I attended, I ran
the following glmfit command:
mri_glmfit
--table aseg_table.txt
--fsgd FSGD/DemographicsSubcortBinaryGroup.fsgd
--C Contrasts/HC-ASPD.mtx
--C Contrasts/ASPD-HC.mtx
--glmdir roi.binarygroup.glmdir
It created all the correct output and subdirectories.
I then used
freeview -f $SUBJECTS_DIR/fsaverage/surf/lh.inflated:overlay=ASPD-HC/sig.mgh
but an error saying "failed to load surface overlay" comes up and the terminal
error message is "number of vertices in overlay data does not match with
surface". I assume this is because I am trying to load a 'whole-brain' sig.mgh
onto a lh surface? Do I have to change the glmfit command to specify
hemispheres, and if so, how do I do that since I do not want to look at
cortical but subcortical data? Or alternatively, can I load both hemispheres
into freeview so the overlay sig.mgh fits?
Thank you so much,
Julia
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