Dear Freesurfers,

I averaged 42 subjects with make_average_subject focusing on Heschl's Gyrus and finally got the image attached (for both atlases (Desikan = Atlas I, Destrieux = Atlas II).

Gray matter surface calculations for Heschl's gyrus showed the following mean values (in mm^2):

Atlas I lh = 439 (SD 60), rh = 323 (SD 46)

Atlas II lh = 340 (SD 70), rh = 253 (SD 47)

Heschl's gyrus depicted in the attached image looks considerably larger for Atlas II, but the surface analysis gives me smaller values for mean surface calculation (Atlas II < Atlas I)

How can that be explained?

Thanks in advance

Holger