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Different participants see different blocks in an experiment

Now I have 4 blocks in my experimental design. What I want is:

Participants 1, 5, 9, 13....will only do block 1 and then they're done.

Participants 2, 6, 10, 14....will only do block 2 and then they're done.

Participants 3, 7, 11, 15....will only do block 3 and then they're done.

Participants 4, 8, 12, 16....will only do block 4 and then they're done.

I was wondering if anyone could tell me how to make this possible in Open Sesame. Thank you.


  • Hi Yanwei,

    You can use the variable "var.subject_nr" in combination with the modulo (%) operator. So for every block loop, put in the run if field something like "(1+var.subject_nr%4)=1" (or 2, 3, 4).

    Does that make sense?


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