[1 2 3 4 5 6 7 ... 25] and your duration will be 1.
Then choose parametric modulation and enter a vector that is defined as 1:1:25. If you have more than 25 events per run, you can use: repmat([1:1:25]',N,1)
where N is the number of events/25 which should be a whole number.
Hope this helps. Let me know if it is still not clear.
Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General Hospital and Harvard Medical School
Office: (773) 406-2464
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On Tue, Apr 26, 2011 at 4:26 AM, Florence POMARES
<[log in to unmask]> wrote:
Dear SPM users,
We have a block design with 4 different conditions (duration = 25 s) and 3 sessions. We wanted to know how to model a linear increase of bold signal (HRF) over the duration of the stimulus (not over the session), for each condition.
The closest solution we found was to use FIR modeling, is there an other way to model that?
Florence
