Hi Jeff,

they different parcellations based on different anatomical conventions. The aparc.annot is simpler (fewer units) and gyral based, while the aparc.a2005s has more units divided into sulci and gyri.

cheers, Bruce

On Fri, 30 Jan 2009, Jeff Sadino wrote:

Hello all,

Thank you for your quick replies to my previous posts. One more

question. I am wondering what the difference is and if I should be taking average thickness measurements for cortical regions from lh.aparc.a2005s.stats or lh.aparc.stats. I think the main difference is that lh.aparc.a2005s.stats was made with ?h.atlas2005_simple.gcs and lh.aparc.stats was made with ?h.curvature.buckner40.filled.desikan_killiany.2007-06-20gcs. Which one is more accurate? I am using freesurfer 3.0.5.

Thank you, Jeff Sadino _________________________________________________________________ Windows Live? Hotmail®?more than just e-mail. http://windowslive.com/howitworks?ocid=TXT_TAGLM_WL_t2_hm_justgotbetter_howi...