Hi,
The maps should indeed be reasonably Z-shaped under the null. I'm
afraid your question isn't very precise about what you want to do with
them though, so I can't say much more than this?
Cheers.
On 30 Jan 2008, at 12:01, Giovanni Giulietti wrote:
> Hi,
>
> I used MELODIC ICA on several fmri data sets.
> I was wondering the relevance of performing basic mathematical
> operations
> such as adding and meaning on these raw-z transformed IC maps
> (melodic_IC.nii.gz). In other words, is it correct to consider them
> as z-
> maps with the knowledge that they better fit the GGM (Gamma Gaussian
> Mixture) model?
> Thanks for your precision.
> Giovanni.
>
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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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