Hi,
I have a question regarding t contrasts.
Lets say my design has 4 conditions and I want to see the results of 2
conditions minus the other 2. as I see it I have 2 options:
1.a simple t test :
-1 -1 1 1
2.a multiple vector t test:
0 0 0 1
0 0 1 0
0 -1 0 0
-1 0 0 0
My questions are:
1. What is the difference between the meaning of these 2 options?
2. In the second option, spm doesn’t let me to set a threshold for the num of
voxels so I get a blurry result image.. can I do anything about it?
Thanks a lot,
Liora
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