Indeed - and you might also need to turn on the "real EVs" option in
the contrasts section if you haven't already, in order to include the
derivs in contrasts.
Cheers.
On 22 Feb 2008, at 14:50, Mark Woolrich wrote:
> Hi karl,
>
> If you want to include the temporal derivatives explanatory power in
> a first-level analysis then they (along with the EV of interest) are
> treated just like any other basis set. Assuming EV1 is the EV of
> interest and EV2 is its temp derivative, this would be done with an
> f-test used that contains a [1 0] and a [0 1] contrast to combine
> the explanatory power.
>
> Cheers, Mark.
> ----
> Dr Mark Woolrich
> EPSRC Advanced Research Fellow University Research Lecturer
>
> Oxford University Centre for Functional MRI of the Brain (FMRIB),
> John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK.
>
> Tel: (+44)1865-222782 Homepage: http://www.fmrib.ox.ac.uk/~woolrich
>
> On 22 Feb 2008, at 00:14, dartmouth fsl wrote:
>
>> Hello,
>>
>> I'm trying to include temporal derivatives (i.e., not regress them
>> out) in my model per the Calhoun et al., 2004 paper. In my
>> design.con file, I added 1s to the columns and re-ran design.fsf,
>> but this didn't do the trick. Any suggestions?
>>
>> Thanks,
>> karl
>
---------------------------------------------------------------------------
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
---------------------------------------------------------------------------
|