What I had in mind was entering additional information about each regressor.  For example, in addition to the onset telling you what class of stimulus was presented at that time, you could encode the emotional valence of the stimulus as a continuous variable.  From there, you could examine whether the magnitude of the valence had an effect on the HRF.  The concept is identical to the "Parametric Modulator" option in SPM and the "AM_2" option in AFNI.

Thanks,

-Andrew

On Thu, Jun 17, 2010 at 4:54 PM, Douglas N Greve <greve@nmr.mgh.harvard.edu> wrote:
What kind of parameters do you want to change? Eg, delay or dispersion of the HRF?

doug

Andrew Jahn wrote:
Hi FreeSurfer experts,

I was wondering whether you are able to use parametric modulators during FS-FAST.  All I can see from the mkanalysis-sess gui is setting up contrasts, but I would also like to see how other parameters affect the size and shape of the bold response.  Is there any way to do this in Freesurfer?  If not, is there a way to visualize parametric analyses done in another software package (e.g., SPM) on a brain processed in freesurfer?

Thanks!

-Andrew
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