Sounds very strange - this implies HUGE spatial smoothing. I doubt
that GRF theory is valid in this case of .361 resels.
If this is true you may as well just average over the ROI and do a
single t-test, then there's no need for multiple comparison correction.
Cheers.
On 30 Nov 2006, at 19:41, Francesca Filbey wrote:
> Dear Steve,
>
> How many resels should a dataset have for a voxel-correction to be
> valid? I
> have a small volume with .361 resel (237 voxels in the VOI mask and
> 656
> voxels per resel in the dataset). What kind of correction would you
> suggest
> for this particular volume?
>
> Thanks,
> Francesca
>
>
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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)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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