Hi all,

I used QDEC compare differences between normal subjects and patients, the activation can be seen without correction, after correction by FDR ,all disappeared.I read about the Clusterwise Correction for Multiple Comparisons of the manual. I am confused about the meaning of Correction. I use the simulation when an error is as follows: ############################################################################################# ERROR: dimension mismatch between X and contrast /usr/local/freesurfer/subjects/sad/qdec/Untitled/tmp.mri_glmfit-sim-2797/lh-Avg-Intercept-area.mtx X has 8 cols, C has 2 cols ############################################################################################# Why is that? Also could you please give some recommendations on the correction. Thanks for your reply, i 'll be very grateful to you for your help.

LJ