The "area" of a vertex is the average area of the triangles around the vertex. In fsaverage space, a vertex will map back to a given vertex in the individual subject, so the area of the vertex gets transferred back to fsaverage. And, yes, the area is measured in mm2.

On 11/8/16 8:45 PM, Lachlan Strike wrote:

Dear FreeSurfer Developers

I have a question regarding the area measures for subjects following registration to fsaverage (produced through the qcache flag – lh/rh.area.fsaverage.mgh).

What do the values for each vertex represent? Is it correct to state that these measures are in mm^2 , or are these measures now somehow relative to the corresponding vertex values within fsaverage?

Best regards

Lachlan

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