Hello SPMers,
In my first level design I have two conditions (A, B) and one regressor
(a string of values, C), and realignment parameters (6) as multiple
regressors.
My first level contrast was [1 -1 1 0 0 0 0 0 0].
Does this contrast mean that:
a) the results are derived from condition A > condition B, "AND"
regressor C
or
b) the results are derived from condition A > condition B, "OR"
regressor C?
In other words, the SPMs results show
~ high activation where both A>B AND C have high values or where A>B OR
C have high values?
~ do I still get results where A > B and not affected by C, from the
contrast [1 -1 1 0 0 0 0 0 0]?
Comments are welcomed
Thank you
Daniela
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