Hi,
On 7 Oct 2008, at 08:27, Tim Silk wrote:
> Hi,
> I am having troubles in the higher level Feat analysis. Each
> subject does
> 2 sessions, so I run mid-level analysis to combine the sessions.
> However, I
> have a few subject that completed only 1 session that I want to
> include.
> Errors occur when I run these subjects in the analysis and no post-
> stats
> appear.
I presume that you are using fixed-effects to combine each subject's
first-level results at second level, separately for each subject.
> An oddity I have noticed is that even though the registration is run
> in the
> first level analysis, the report pages show activation displayed on
> non-standard brains.
This is because first-level analyses are always reported in native
space, even though registration has been run (and remembered for later
usage).
> The report pages for the mid-level analysis show the
> activation on a standardised brain (despite no registration
> happening at
> mid-level).
That's right - each subject's second-level fixed-effects analysis will
take place in standard space. The registration that had been
calculated at first-level is applied at the beginning of the second-
level analysis.
> I have tried this both adding the .feat directories (with the same
> named
> copes) as well entering the individual copes.
For combining a mixture of first- and second-level analyses at third
level, see the FAQ:
http://www.fmrib.ox.ac.uk/fslfaq/#feat_mixedup
Hopefully this will still work for the latest version of FSL; if not,
let us know.
Cheers.
>
>
> I hope that makes sense. Please help me work this out.
>
> Regards,
> Tim
>
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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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