Hi,
I am also interested in running a PPI on ER-data. Could you point me
to the paper in question?
Could it be that in SPM there is/has been no option to leave
regressors unconvolved as it is with FSL? Perhaps this would not make
such a difference with a large block, but rather more so with a stick
function (if it became convolved twice, once physiologically, and the
second time by SPM) - could that be the reason? From Jill Kelly's
instructions I gathered that if you enter a timecourse you extracted
beforehand and choose "do not convolve", you should be fine, as the
brain "convolved" the timeseries with its genuine HRF anyway. Any
experts have an opinion on this?
If you get any news on this, I'd be interested to hear about it.
Thanks
Cornelius
On Wed, Feb 17, 2010 at 5:35 PM, Ilya Veer <[log in to unmask]> wrote:
> Hi all,
>
>
>
> I would like to do a PPI analysis on event-related task data which have been
> analyzed in FSL already. Following Gitelman’s paper, it seems that
> deconvolution of the physiological time-course (derived from the seed ROI)
> is a prerequisite when doing PPI’s on event-related designs. However, FSL
> doesn’t provide a tool for this. I tried to deconvolve the time-course using
> SPM, but I couldn’t manage to do this without running the entire analysis of
> the task data in SPM. Does anyone have experience in analyzing PPI’s on
> event-related data in FSL? Is it at all possible to obtain a deconvolved
> time-course without running the entire analysis in SPM? Lastly, is there an
> alternative for deconvolution when doing a PPI on event-related data in FSL?
> Any help with this issue would be greatly appreciated!
>
>
>
> Cheers,
>
> Ilya Veer
>
>
>
> ______________________________________
>
>
>
> Ilya Veer, M.Sc.
>
> Leiden Institute for Brain and Cognition (LIBC)
> Postzone C2-S
> P.O. Box 9600
> 2300 RC Leiden
>
> The Netherlands
> Tel. +31 71 526 1375
--
Dr. med. Cornelius J. Werner
Department of Neurology
RWTH Aachen University
Pauwelsstr. 30
52074 Aachen
Germany
Institute of Neuroscience and Medicine
MR Physics - INM4
Research Centre Juelich
52425 Juelich
Germany
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