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counterbalancing help

ABXABX Posts: 1

Dear All,

I would like to automate the counterbalancing in an experiment as much as possible and have looked at the counterbalancing tutorial and several posts on this forum but still am unsure.

We have: 2 file pools x 3 audiovisual modalities x 2 music styles (and 24 participants)

I need to satisfy the following:
1) Several video clips will be presented in three modalities: Audiovisual (AV), Visual only (VO) and Audio only (AO), so 3 different orders need to be counterbalanced within-subjects.
2) We are creating 2 separate file pools so that we prevent carryover effects between AV and VO/AO conditions. These will have to be counterbalanced, e.g. odd subject numbers get AV from file pool 1; VO and AO from file pool 2, and vice versa for even numbers.
3) There will be two different music styles: 1 and 2, the order of which would preferably also be counterbalanced within-modality but could also be randomised. (Video files will also be randomised within music style – but that’s easy!)

Could someone please help? I think Edwin’s solutions (April 2013) would be useful if I could understand how to implement them in the experiment procedure (see: http://forum.cogsci.nl/index.php?p=/discussion/415/solved-specific-participants-specific-conditions)

As a really clunky fix, I could hard code the experiment so that there are 12 conditions and then subjects are assigned just one condition only. But I'm still not sure how to do this. I can do an inline script, but how to set up the procedure?

Any help would be most appreciated!

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