Dear SPMers,
I am using event-related fMRI to compare six conditions, (f1,f2,f3,c1,c2,c3)
each presented once and in that order, where I want to see significantly
increased areas found with the last three conditions taken together
compared to the first three taken together.
Using hrf (with temporal derivatives) do I define my contrast as
(0 0 0 0 0 0 1 0 1 0 1 0) or as
(0 0 0 0 0 0 1 1 1 1 1 1)
What are the reasons or benefits for using hrf (alone),
hrf(w/ temp derivatives),
or hrf (w/ temp derivatives and dispersion)
Morgan Willson
MSc student
Biomedical Engineering
University of Alberta
Canada
|