Benedicte,
I think you can use the "time modulation" option under "conditions"
when you set up the 1st level modeling in SPM.
Jim
James N. Lee, Ph.D. (Biomed. Eng.), M.S. (Psychology)
Imaging and Neurosciences Center
729 Arapeen Drive
Salt Lake City, Utah 84108
801 581 4228
On 9/27/10, Benedicte Descamps <[log in to unmask]> wrote:
> Dear list,
>
> I'd like to ask this question again: I've acquired data in a blocked
> design. I'd like to investigate whether there are changes over time in
> the activation blocks (e.g. block after block increased amplitude over
> time). I cannot just average the data per condition and compare
> activation vs. rest, since changes over time would not be picked up.
> How can I detect these changes? Does anyone know what kind of regressor
> should I include in the design matrix for my analysis?
> Thanks!
>
> Kind regards,
> Benedicte
>
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