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Hi I am doing a go-no go 1st level fMRI study. There are 6 types of stimulus, each with 3 blocks, each block has 10 targets and 10 distracters. 1. happy go, sad no go 2. happy go, neutral no go 3. sad go, happy no go 4. sad go, neutral no go 5. neutral go, happy no go 6. neutral go, sad no go I think that's block designed, so I should use Custom 3.... I will have 6 EVs since I have 6 types of stimulus And The triplet is: 1st number= onset time of the block 2nd number=duration of the block 3rd number=1 And I will have 3 triplets per EV (since there are 3 blocks per type of stimulus) So overal 3*6=18 triplets Is that okay? Thanks a lot!