Hi,
It's not recommended to do no smoothing at all - you can run it and
have a look at the outputs certainly, but certain steps, in particular
the prewhitening, may be more robust with the default small amount of
smoothing.
So if you want to run with and also without smoothing I would
recommend just running it twice, once for each of the needs you have.
Cheers.
On 21 Apr 2009, at 20:39, Dav Clark wrote:
> I would like to view my single-subject data unsmoothed, but then for
> the group analsys of course I should smooth.
>
> The question is, can I run lower level analyses on unsmoothed data,
> then smooth the cope and run a higher level analysis on the smoothed
> cope? Or does that trash the way FSL keeps track of variance
> somehow? (I'm still trying to figure out exactly how Flame deals
> with within subject variance).
>
> Thanks,
> Dav
>
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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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