Dear AFNI experts,
I am trying to do multiple testing correction by using 3dClustSim in ROI, but I have encountered a problem. Here is what I have done. I would really appreciate if anyone could point out the mistake I made.
Data: Group Analysis
Step 1: I created a mask for whole group, and then use the 3dClustSim to obtain the minimum cluster size to reach significance.
- My whole brain mask is 46x55x43 3.50x3.50x3.50 mm^3 (108790 voxels)
Step 2: Then, I created a mask for ROI region (Hippocampus) by following the instructions in this website: [
homepage.usask.ca]
My problem is: Why after I draw my ROI, my ROI's mask is the same size as my whole brain mask? I thought the size of ROI should be reduced so that I could have different threshold and cluster size to reach significance. Could anyone help me to solve this problem?
Thank you so much for your help.
