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
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
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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.eduwrote:
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
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422
Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html
I'm not that familiar with the parametric modulation option in SPM. Is it changing the height of the HRF on an event-by-event basis or is it changing the HRF parameter (eg, delay dispersion) on an event-by-event basis? The former we can do, the latter we cannot.
doug
Andrew Jahn wrote:
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 mailto: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 ------------------------------------------------------------------------ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html>
freesurfer@nmr.mgh.harvard.edu
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Andrew Jahn -
Douglas N Greve