I am a new user of freesurfer 5.0 to find the thickness differences between con and pat,and I have processed the data all right with recon-all.But I have several questions about qdec.I hope someone can help me.

I just input the data in qdec.table.dat ,with others options just as the default,but the thickness output from the Find Clusters and Goto Max is difference from the data displayed on the teminal before qdec's analysis, why?

And also,can somebody explain the function of the buttons in the qdec's third step (display),such as Set using FDR in the False Discovery Rate ,Monte Carlo Null-Z simulation.In detail, in my research, I just want to find the thickness differences between con and pat in the 33 ROI per hemisphere,if I just let these buttons as the default ,is it right ?

Last, what does the "MAX" and "VtxMAX" and "NVtxs"mean just as follows,which is output from the teminal.

Generating cluster stats using min threshold of 2... Found 5 clusters Contrast: 'rh-Diff-Yes-No-Intercept-thickness', 10fwhm, DOF: 21 ClusterNo Max VtxMax Size(mm2) TalX TalY TalZ NVtxs Annotation --------- --- ------ --------- ---- ---- ---- ----- ---------- 1 -3.4159 8928 51.50 31.9 -34.9 46.8 146 postcentral 2 -2.6111 120796 42.30 30.5 -6.5 -32.9 79 entorhinal 3 -2.5302 122287 22.28 35.4 -68.1 43.1 41 inferiorparietal 4 2.3762 145773 21.24 40.3 22.6 20.6 46 parsopercularis 5 2.1491 24852 19.94 4.8 -40.1 71.5 55 paracentral ============================================================

Thanks in advance!

guihong