Re: [Marsbar-users] ROI creation

[Matthew B. <mat...@gm...>]

Hi,

Sorry to be so slow to reply - both times...

> This question was posted at the beginning av this year, but I could not find
> the answer to it. I am trying to combine a pair of the marsbar AAL ROIs
> (specifically the fusiform and lingual gyri). I want to use it to compare
> these structures bilaterally. I also want to write the combination to an
> image such that I could use it for  analysis via small volume corrections
> within the ROI.
>
> Unfortunately, when I try to combine them I get...
>
> Warning: No volume resulted for ROI
>> In marsbar at 616
>   In marsbar at 1800
>   In marsbar at 485
>   In spm at 1276
>
> I have, however, been able to take a self generated functional ROI and
> combined it with a box ROI.

Is it possible that you have been using

r1 & r2

to combine the ROIs?  This gives you the voxels that are present in r1
_and_ in r2.  If you want voxels that are present in r1 _or_ r2, you
need:

r1 | r2

Does that work?

Best,

Matthew