Hi Nicholas

I wouldn't think so. Look at the cortical parcellations and see if they are accurate. If they are it means that the cross-subject registration must be pretty good
Bruce
On Thu, 20 Oct 2016, Nicholas Heugel wrote:

I am encountering an odd effect when using the Freesurfer maps in Brainstorm.  I have Individual
activity for multiple subjects where the activity generally seems to look generally well spread across
teh gyrus and sulcus in task relevant areas.  However, when I map the individual subjects onto the
freesurfer average anatomy, and average the activity it's primarily in the sulcus that the activity
across subjects is prevalent.  Most notably, it becomes heavily present in the Sylvian fissure. 

I was looking through the mris_register function, and it seems the sulci are used as one of the primary
alignment measures, and was wondering if this could be giving rise to this propensity of the group maps
to appear predominantly in the sulcus.  Looking through the settings I am not 100% clear on what all the
settings do.  So I was wondering if anyone had encountered this issue before.  And what settings for the
mris_register I should look at adjusting to try and correct the issue.

Thank you for your time and assistance.


Nicholas HeugelBiomedical Engineering Ph.D Candidate
Marquette University

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