Re: analyzing unnormalized data

Hi,

Sorry to be slow to reply.

> We are trying to extract timecourses from unnormallized functional data using anatomical ROIs. We have
been using the marsbar batch script, and this crashes marsbar and matlab completely. We've been trying to
debug and have noted that the crash occurs during the "getdata" script. (although we're not sure that this
is the cause of the problem)

Oh dear - that sounds very strange.  Marsbar has no compiled code, so
I think the crash must be somewhere in the SPM routines.  Have you
tried recompiling these?  What platform are you working on?

Matthew

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Re: hrf derivative timecourse

Hi,

Sorry to be slow (again)

> We model the conditions in our fMRI experiment using the canonical hrf and
>
> its first derivative. We would like to see the timecourses associated with
>
> the derivative - does anyone know how to do that using MarsBar, or can
>
> refer us to a piece of code that does that?

Er - no - I don't think there's code in marsbar to do that - marsbar
combines the temporal derivative with the hrf to estimate the shape.
The timecourses for the derivative will of course just look like the
derivative scaled by a scalefactor which is different for each ROI -
and in any case, don't tell you directly about the whole response
shape - is that really what you want?

Best,

Matthew

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SPM 5 problem?

I am using the MarsBar tool I installed for SPM5. When using the MarsBar get
window to find an SPM.mat file created using SPM5 when trying to specify the
design, the SPM.mat file that physically exists does not appear to the MarsBar
get window. If I use MarsBar running in SPM2, the SPM.mat (created in SPM5)
appears. How do I fix this problem?

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SPM_get SPM.mat created in SPM5 error

I am using the MarsBar tool I installed for SPM5 running in Matlab 7.4.0
(R2007a) on a Windows XP machine. When using the MarsBar get window to find an
SPM.mat file created using SPM5, the SPM.mat file that physically exists does
not appear to the MarsBar get window. If I use MarsBar running in SPM2, the
SPM.mat (created in SPM5)appears. How do I fix this problem?

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error combining anatomical ROIs

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