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Dear SPMers, I was wondering about the weight contrasts in first level... I'v seen that in several papers the rule is perform a [1 -1] (condition 1 > condition) and later use this contrasts in a second level analysis. But, my question relay if I can perform contrasts with a weight of [1 0] to identify voxels whose activation increased in one condition and then use this img contrasts in second level. Is this correct? Thank you in advance! Cheers!