Dear SPMers,
to test whether there is any difference (i.e.
irrespective of the direction of signal change) between two conditions, is it
valid to do an F contrast like this:
[-1 0;
0 1]
?
...and extending this to two sessions (repeated
conditions) in one design (let's assume, there are only 2 conditions/colums per
session):
[-1 0;
0 1;
0 0 -1;
0 0 0 1]
?
It looked straight forward to me in the first
place, but now I am confused.
Any help appreciated.
Thank you.
Helmut