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Dear all, thank you very much for your help - just as you suggested, the mask was incorrect (completely black). I checked my settings and I have Threshold (none), Implicit mask (yes), Explicit mask (none). Individual subjects' con images look OK. I think that the best solution would be to make an explicit mask, since I don't know what and why went wrong with the implicit mask - do you think it is a good solution? Thank you again, Jana On Wed, Dec 1, 2010 at 4:18 PM, Michael T Rubens <[log in to unmask]>wrote: > Matlab creates a mask to limit GLM analysis to in-brain voxels. This is > calculated based on a intensity threshold, perhaps it is too stringent. Look > at your Mask.img file in the glm output folder and make sure ~isempty(mask). > > Cheers, > Michael > > > On Wed, Dec 1, 2010 at 7:01 AM, Jana Hanulova <[log in to unmask]>wrote: > >> Hi Erica, >> >> thank you for your reply! Actually, I am not using a mask. That's why I >> was so puzzled by this error message. >> >> Best, >> >> Jana >> >> On Wed, Dec 1, 2010 at 3:05 PM, Erica Julson <[log in to unmask]>wrote: >> >>> Are you using masking? I've gotten this error before when I created a >>> binary mask incorrectly (the mask was just black, so of course there was no >>> area for the program to analyse data within). Hope this helps! >>> >>> -Erica >>> >> >> > > > -- > Research Associate > Gazzaley Lab > Department of Neurology > University of California, San Francisco >