I have 2 types of conditions in my study: A & B. The A-B contrast (for a single subject) does give some expected results. But, I have matching pairs of stimuli for the two condition types: e.g. A1 matches B1, A2 matches B2, etc. (for A1..A40 & B1..B40). They match in that Ai-Bi isolates the thing of interest. So, looking at Ai-Bi for i=1 to 40 should provide more power. But, where & how would I specify this in the SPM Batch GUI?
Thanks.
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