Dear freesurfer experts,

I have analyzed intra-group differences in
              cortical thickness using 
QDEC. It generated the file sig.mgh. 
1.I want to know what does the sig.mgh
              mean? Which   p value and  the cluster size this file
              present?
sig = sign(contrast)*-log10(p). You have to run mri_glmfit-sim
      to get clusters
2.when I clicked the button
 Monte Carlo simulation (p<0,05) and
              listed in the 
qdec
              output file "mc-z.abs.th20
.abs.sig.cluster.summary". However,there is
              no cluster in
the file.Dose that mean there is no
              significant difference between two groups?
correct
I have attached the contents of the output
              file and a screenshot of 
the display window of QDEC.
Thank you in advance for your help.

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