Dear Doug, Many thanks for your e-mail. I've tried to do what you suggested to correct with FDR just using specific regions, but i couldn't find the buttons you mentioned. I thought it was my qdec version so I downloaded the most recent version of freesurfer and did recon all <subject> qcache with everyone. But again I don't see the buttons you said on this version of qdec. Am I missing something terrribly obvious? Could it be that it doesn't work with data pre-processed with earlier version?
Many thanks for your help, Lucia > > > Lúcia Garrido wrote: > >>Dear all, >> >>I have a few questions about stats in freesurfer that I'd be very >> grateful >>if you could answer. >> >>1. Is it possible to reduce the search from the whole brain to a smaller >>region of interest to apply corrections for multiple comparisons? For >>example, if I'm interested in differences in the fusiform gyrus, can I >>restrict the FDR correction to the fusiform? >> >> > > Yes, click in the fusiform, click on the "Mark Label" button (or > tools->Labels->Mark Selected Label), then check the "Only Marked" button > next to the FDR, then "Set Threshold Using FDR", the "Apply". > > Not sure about the others. > >>2. Is it important to control for any global measure when comparing >>cortical thickness? For example when comparing grey matter volume, it's >>good practice to control for the intracranial volume. In case of cortical >>thickness (and other dependent measures in freesurfer), do you know how >>these are affected by the intracranial volume (or other measures) and how >>these could be controlled? >> >>3. Finally, I posted a question a few days ago about comparing volume >>using freesurfer. I'm sorry for insisting on this but I still haven't >>found any response. My question was whether it's possible to compare >>volume maps in freesurfer. I'm using an older version (4.0.4) and my >>impression is that the most recent version might have this feature, but >>this is unclear to me. I'd be very grateful if you could let me know if >>this is the case. And if there's any way in which I can compare volumes >>usig data pre-processed using the version I have. >> >>Thank you very much! >> >>Best wishes, >> >>Lucia >> >> >> >>_______________________________________________ >>Freesurfer mailing list >>Freesurfer@nmr.mgh.harvard.edu >>https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> >> >> >> > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > [EMAIL PROTECTED] > Phone Number: 617-724-2358 > Fax: 617-726-7422 > > In order to help us help you, please follow the steps in: > surfer.nmr.mgh.harvard.edu/fswiki/BugReporting > > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
