Dear all,
Thanks for your help in advance.
When I am specifying a second level model to do a two-sample t-test (I'm comparing two groups) and I include an explicit mask (which ROI I created in marsbar), I end up with an SPM file which doesn't have an xVol as part of it. I noticed this because when I try and do the estimation it says there is an error due to the lacking xVol thing.
What's weird is that when I don't use the ROI the model estimation works fine and my SPM file has an xVol part.
And what's also weird is that when I use the ROI as part of a model estimation when I'm just doing a one-sample t-test (using the same contrast files), it also works fine.
Any idea what I could be doing wrong or how to make it work when I'm doing a two-sample t-test?
Thanks!
Will
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