Dear Freesurfer Mailing List,
I sent the below email last week and have not yet recieved a reply. Does
anyone have any ideas about the problem I am experiencing?
Kind regards,
Bronwyn Overs
Research Assistant
Neuroscience Research Australia
Neuroscience Research Australia
Margarete Ainsworth Building
Barker Street Randwick Sydney NSW 2031 Australia
*M* 0411 308 769 *T* +61 2 9399 1883 *F* +61 2 9399 1265
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On 7/04/2015 11:48 am, Bronwyn Overs wrote:
Dear Freesurfer Mailing List,
I have just run a GLM analysis using mri_glmfit with area as the
measure of interest. For each of my significant contrasts, I extracted
the mean area for each subjects from the corresponding
cache.th13.abs.y.ocn.dat file. I then plotted these values to examine
the nature of the interaction. In doing so I identified three
individuals who had extreme mean area values (up to 11 sd from the
average of the mean area) for many of the significant clusters. For
each of these individuals I cannot see any problems with the
freesurfer .mgz files or the cortical segmentation.
So my questions are:
1. Are extreme mean values for significant clusters in GLM a problem?
If so, do you have any idea what could be causing these values if the
scans appear to be well segmented?
2. If the significant clusters are calculated at a group level, how
are the individual mean values (in cache.th13.abs.y.ocn.dat) generated?
--
Kind regards,
Bronwyn Overs
Research Assistant
Neuroscience Research Australia
Neuroscience Research Australia
Margarete Ainsworth Building
Barker Street Randwick Sydney NSW 2031 Australia
*M* 0411 308 769 *T* +61 2 9399 1883 *F* +61 2 9399 1265
neura.edu.au <http://neura.edu.au>
Follow @neuraustralia on twitter
<https://twitter.com/neuraustralia>Follow NeuRA on facebook
<https://www.facebook.com/NeuroscienceResearchAustralia>
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