Dear sir
I 'm a beginner for fMRI. I have some questions on fMRI analysis. I
use SPM2. This is event-related design. Homodynamic Basis functions is
sellected as "hrf". There are six conditions in my session, i.e. SS,
OS, VS, SW, OW, and VW. I want to subtract SW from SS, OW from OS, VW
from VS, and SW+OW+VW from SS+OS+SW. How can i get theses comparisons.
I also want to know the differences between F contrast and t contrast.
Furthermore, could you tell me the vector onsets should be 0 or 1 for
the first scan? Where are differences between "SS mask SW" and "SS
minus SW" in "Results"?
thanks a lot!
sincerely
Dr. Xiao-dong WANG
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