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Dear FSL community, I am examining two different groups using the two group unpaired t-test. I was just curious how the comparision threshold maps are generated and what each actually means. For instance for A>B (f is my control group and B is my experimental group) does it show the difference between the two groups or is it looking at where correlation is greater in A than in B? The reason I am asking is that when I look at the comparision maps there is correlation in regions that are not shown in the average images. For example the A>B threshold image will show correlation in the PCC/ precuneous region however in both mean average images there is no corelation with this region. I was wondering what the significance of this is. Also a side question. Is there a way to count number of activated voxels in only one hemisphere of the brain? -Thank you Willam Sohn