The data in aparc.stats contain surface area, gray matter volume, and average thickness for whole regions, and are not intended for surface display. If you want to analyze those regional values use 'aparcstats2table' and then import the data into your preferred statistical package for further analysis. If you want a specifically vertex-wise analysis then see the tutorial for using QDEC.
cheers, -Mike H.
On Thu, 2010-05-06 at 11:33 -0400, Rajagopalan, Venkateswaran wrote:
Dear All,
I am sorry to post this message again. Since i am not able to find from the tutorial and archives what i need i am posting it. I want to compare cortical thickness values in each region from aparc.stats file between control and patients. I am wondering whether it is possible to compare all the regions given in aparc.stats file and give a map showing which of these regions are significantly between the two groups (like VBM the final p map will give you regions which are significantly different).
Do i need to create a separate contrast matrix for each and every regions (for eg one contrast for lh.cuneus,one for lh.temporalpole etc) or like in VBM studies you give a single contrast matrix and design matrix since you are testing the same hypothesis in different regions of the cortex.
I also would like to know whether i have to do multiple comparisions when i am testing for same hypothesis in different regions or not needed. In the tutorials i find mostly regression between thickness and demographic parameters so any suggestion or guidance to where i can find tutorial or materials related to my above questions.
Thanks
venkat
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