Dear SPM community,
A question regarding second level analysis and contrasts;
Our task has 3 conditions and a rest state. I want to compare
condition 1 with condition 2 for 15 subjects. How should I perform
the second level analysis (paired t-test);
More specifically, should i first make a contrast image for condition
1 (by entering the following contrast: 1 0 0 0) and then make the
contrast image for condition 2 (by 0 1 0 0). Or should my contrasts
be different?
Can't i just simly use the contrast image from obtained
from 1 -1 0 0 ?
Thanks in advance,
Matthijs
Matthijs Vink
Functional Imaging
Dept. Psychiatry
University Medical Center
Room A.01.126
Heidelberglaan 100
3584 CX Utrecht
The Netherlands
tel. (31) 30 250 7121 (work)
tel. (31) 30 250 8352 (work)
tel. (31) 30 231 0171 (home)
www.fMRI.nl
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