Hello to all,
As this is my first use of spm99b, I have some basic questions regarding
model specification. Our experiment is 210sec in total, consisting of 2
stimulus presentation blocks, each lasting approximately 69sec. In summary
the experiment consists of
rest(24sec),stim(69sec),rest(24sec),stim(69sec),rest(24sec). Since the
exact timing is variable depending on reaction time, the scans per epoch
are variable between patients, and never quite follow the above model
explicitly. How do I account for this in specifying the fMRI model for
this experiment? If rest periods are implicitly modeled, then do I just
have 2 sessions to specify, or 16 if I have 8 subjects?
Thank you,
Edward Kovalik
[log in to unmask]
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|