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Hi all I have an event related task composed by a cue-target-response-target2-response2 the cue-target sequence produces a congruent or incongruent trial. I have two type of target. so I have four different conditions Cong1, Incong1, Cong2, Incong2. my ReactionTimes data tells me that I have a facilitation In Cong1 (respect to incong1) but not in Cong2 (respect to incong2). I would like to infer which areas can explain this to explain the facilitation, I can make cong1 vs incong1 contrast with 1 -1 0 0 -1 1 0 0 and cong2 vs incong2 contrast with 0 0 1 -1 0 0 -1 1 but how can i test (cong1 vs incong1) vs (cong2 vs incong2) ?? which should emulate my reaction times differences I think that it shouldn't be 1 0 -1 0 -1 0 1 0 which is instead Cong1 vs Cong2. not exactly the same I think. (P.S. What an orrible explanation!) thanks in advance cheers Alberto