Hi FS experts and users, May I ask some questions about clusterwise correction for multiple comparisons? 1,In mri_glmfit-sim command, there is a --sim(--sim nulltype nsim threshold csdbase) option. Choose the voxel/vertex-wise threshhold used to define clusters. This will be -log10(p), where p is the p-value. Eg, to use all voxels/vertices with p < .01, then set the threshhold = 2.I want to know what is meaning of "using all voxels with p < 0.01". Does it mean that considering all voxels whose p value below 0.01 in every iterations. Then it generates some clusters in every iteration. Is it right? 2,Also there is a --sim-sign option in this command. I want to know meaning of the sign: abs,pos,neg.Does it represent one- and two-tailed tests? Thanks. All the best. Rujing Zha 2014-02-20
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