Hi - see recent posts on this - but the simple answer is that by
default FEAT will ONLY analyze those voxels which are valid for all
subjects.
Cheers.
On 29 May 2009, at 16:03, Anna-Maria D'Cruz wrote:
> Hi FSL users,
>
> I have a question regarding the FOV of my individual data sets and
> how the
> images are combined at the group level. The FOV I am using for
> individual
> subjects cuts off varying amounts of the top and bottom of the
> brains of
> each subject. When I combine subjects in higher-level analyses, how
> does FSL
> statistics cope with the fact that only 10 out of 20 subjects may
> have some
> of the very top or bottom slices? Of course this is going to affect
> the
> likelihood of finding active voxels in those slices. Is there a
> weighting
> criterion, i.e. if at least 15 out of 20 subjects have that voxel
> active, it
> gets included in the group analyses?
>
> Thanks,
>
> Anna-Maria
>
> Anna-Maria D'Cruz
> University of Illinois at Chicago
> Center for Cognitive Medicine
> Department of Psychiatry
> 912 South Wood St., Suite 235 (M/C 913)
> Chicago, IL 60612
> Phone: (312) 355-5651
> http://ccm.psych.uic.edu
>
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
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