Dear SPM users
I want to compare neuronal activation (positive contrast) and deactivation
(negative contrast) between two groups. In my analysis both the positive as
well as the negative contrast is of interest (1st-level con.imgs as [1 0
...] and [-1 0 ...] respectively).
I realized that comparing the two groups [1 -1] in terms of positive
contrast is the same as comparing the two groups the other way around [-1 1]
based on negative contrasts. This is not good. I want to see both group
comparisons (A<B and A>B) separately for the activation maps and
deactivation maps respectively. This should result in 4 different results.
Why is there this redundancy?
How can I test the two groups for differences in the activation maps and
deactivation maps separately?
May the fog burns off due to your wellcome input
RL
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