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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




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Research Associate
Gazzaley Lab
Department of Neurology
University of California, San Francisco