I tried three different contrasts: [1 -1 1 -1] [1 1 -1 -1] [ 1 -1 -1 1] for all the 6 runs for subject 1 and 2 just to see if I could exclude one of these, but I got very different results and I can't decide which to take out and which not.
Is it normal? Should I do every first level analysis including the three contrasts?
Thank you,
Carlotta.
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