Hi Gang - Ok, I reduced a subject comparing:

CSPLINzero (0,15,6)
CSPLINzero (0,18,7)

for my 3s TR data. I've attached a screen shot of the results for the first 6 TRs. Red is (0,15,6) and Blue is (0,18,7). I'm not sure I understand why they look so different in the beginning? I thought by including an extra time point, I would retain any differences on the 2nd to last time, but that they would be similar earlier. But that is not the case - the BOLD change goes UP from point 0 to 1 for the (0,15,6) reduction and DOWN quite a bit for the (0,18,7) reduction. Any help in understanding this appreciated.

thanks, mb

p.s. I did attach a file but it doesn't look like it worked - if not , just let me know.