Hi,
If you can consider that the resulting COPEs (fitted BOLD effect size
or contrasts of BOLD effect size) are _comparable_ across different
first-level analyses, then yes this is ok. You do obviously need to
think about whether having different lags allows this comparability -
maybe in fact you put this lag in _in order_ to make different
subjects more comparable.
Cheers, Steve.
On 11 Aug 2007, at 21:04, Jorge Mallen wrote:
> Hello,
>
> Is it OK to run post-stats on a group of .feat directories at once,
> even though each directory had a
> different EV's? In my case, the EV's differed in the mean lag of
> the gamma function that was
> convolved with the square wave.
>
> Thanks!
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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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