I want to look at activity in my subjects' retina for one of my experiments. I did volume-based analysis in freesurfer version 5.3 but I noticed that activity outside of the brain has been masked. Is there an option somewhere along the processing pipeline to prevent masking of activity outside the brain? I know that freesurfer version 4.5 does not do this masking, but was wondering if there was a way to stick to the current freesurfer version.

Thanks you in advance for your help.

Cesar