Hi
in FEAT you'd model this kind of setup using 5 EVs, i.e. one EV per
condition. Your questions (con1 vs rest etc.) then correspond to
contrasts across these 5 EVs. Each EV should be 0 when the condition
is off and 1 when the condition is on - this binary sequence you'd
then convolve with a haemodynamic response functio, see http://
www.fmrib.ox.ac.uk/fslcourse/lectures/feat1/feat1_part2_slides.pdf
for details
cheers
Christian
On 28 Sep 2006, at 18:39, Joongnam Yang wrote:
> Hi all,
>
> I have the following design.
>
> 0 0 0 0 0 1 3 2 4 5 4 3 2 5 1 (this series repeated 8 times)
>
> The first five are Blank. Next five are Condition 1, and the last
> five are Condition 2.
> Each of 1 thru 5 are different stimuli.
>
> My job is to compare
> (1) each of Condition 1 against blank
> (2) each of Condition 2 against blank
> (3) each of Condition 1 against each of Condition 2 (between the same
> stimulus numbers)
>
> So, for example, if I focus on stimulus 1,
> then, I need to compare
> stimulus 1 of Condition 1 vs blank
> stimulus 1 of Condition 2 vs blank
> stimulus 1 of Condition 1 vs stimulus 1 of Condition 2.
>
> Would someone suggest how to make design files that FSL can
> understand?
>
> Thanks in advance.
>
> Nam.
--
Christian F. Beckmann
Oxford University Centre for Functional
Magnetic Resonance Imaging of the Brain,
John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
Email: [log in to unmask] - http://www.fmrib.ox.ac.uk/~beckmann/
Phone: +44(0)1865 222551 Fax: +44(0)1865 222717
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