Not sure if your questions have been answered, but here's a link to a previous discussion on the same topic.
https://www.jiscmail.ac.uk/cgi-bin/wa.exe?A2=SPM;347bbbf.0905
Josh
On Jun 9, 2011, at 10:35 AM, Klooster, Debby wrote:
> Hi SPM-users,
> Two weeks ago, I sent the same question but since nobody responded (yet?) I would like to ask again. It would be very glad if anybody can help me…
> So, I’m still trying to do fMRI resting state analysis with SPM and I would like to estimate the HRF, since it was known that the HRF can differ between subjects, different brain regions etc. So I would like to implement the Finite Impulse Respons (FIR). However, when I do the analysis, I see that in the design matrix the parts of the FIR are white (as expected) but there occurs some kind of blurring along the edges (the design matrix is attached in this email). Does anybody know where this comes from and how I can get rid of it? Furthermore, does anybody know the optimal settings for the order and window?
> All suggestions are more than welcome!
> Thank you in advance!
> Debby
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> <designmat_wl100_order20.pdf>
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