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Hi everyone,

I'm analyzing fmri data at the second level.
Suppose I have 4 visual stimuli for the subjects, A +/- sound and B +/-
sound.
And I divided subjects into Group X and Y.
Now I wish to compare activation difference between groups:
eg. {X, A+} - {Y, A+}
It's always comparing X and Y with same stimuli condition.
How should I specify the second level?

Thanks for help,
Andy