Hi Angela, Marie is the best one to answer the questions about gyrification, but I've tried below doug
On 11/28/2012 11:30 AM, angela.favaro@unipd.it wrote:
Hi all,
I would need some information about the local gyrification index. I run the analyses and found which are the average indices for subject and hemisphere.
- Is there a method to perform vertex-wise group statistics? that is may
I compare maps of gyrification across groups?
You should be able to use mris_preproc and mri_glmfit similar to doing a thickness analysis.
- Is there a method to obtain average gyrification for a single label of
the atlas? For example gyrification of superior frontal gyrus. I understand that sulci are often used to find the delimitation of a gyrus or a brain area, and probably this is a problem.
You should be able to run mris_anatomical_stats or mri_segstats to give you summaries over the annotation ROIs.
- Are there any other method to measure the presence or the depth of a
sulcus. We are analysing a group of subjects with a genetic illness. They often lack a sulcus in the orbitofrontal area. Is there a method to quantify this using freesurfer?
You can try doing a group analysis using ?h.curv or ?h.sulc (instead of ?h.thickness). doug
thank you for your help
best wishes
Angela
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