Hi all,<div>&nbsp; &nbsp;I need to know how is the SurfArea in ?h.aparc.stats calculated by FreeSurfer? Since each cortical parcellation has its own thickness in 3D space, does the surface area computation consider both the exterior surface (i.e. the surface separating the gray matter and the background) and the interior surface (i.e. the surface separating the gray matter and the white matter)?&nbsp;</div><div>&nbsp; &nbsp;Thanks!</div><div><br></div><div>Zhuangming Shen</div><div><br></div><div><br><br><span></span></div><br><br><br>