Hi,
I pre-processed each subject of my study group using default settings in VBM for SPM5 (I followed the VBM5.1 for SPM5 manual) and then, while building a statistical model, I did a simple regression analysis (Factorial design specification) to examine the correlation between gray matter volume change and a behavior score.
I got a nice regional gray matter volume change which corresponded to my hypothesis. However, I did find some activation blobs in cerebral ventricle and even outside the brain. What's wrong and what should I do (should I change any default settings?)?
Thanks for any help!
Carlos
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