Pseudorandomization

Comments

• eduard

  January 2023

  Hi Arsal,

  If I am not mistaken, importing excel sheets as loop tables is supported in Osweb. So even if the advanced loop operations are not supported, you could generate the sequences outside of the Opensesame (with the software of your choice), and inside Opensesame import it to populate the loop table with those settings. See here.

  Hope this helps,

  Eduard

  
• Fab

  January 2023

  Hi@arsal_go,

  @eduard is right, OSWeb supports the importing of csv files in the loops since version 1.4. If your pseudorandomization is demanding, the best option may be to create your stimuli sets offline (using the programming language of your choice) and to set your task to import one (for example based on the subject number).

  If you're at ease with Javascript programming, you could also read a generic csv file using csvParse javascript library (available from OSWeb 1.4) to parse its content into variable, manipulate them using Javascript programming to achieve the pseudorandomization you're after, and then populate the loop table. Note that this method will require that you do some coding and that, depending on how constrained the pseudorandomization is, there is a risk that the task gets stuck if no solution is found.

  I posted something on this issue a while back, that you may find useful if you decided to go down the second route: https://forum.cogsci.nl/discussion/7413/demo-how-to-parse-a-csv-to-populate-a-loop-osweb-1-4

  The first route is simpler in terms of the programming of the task, though.

  Hope this helps,

  Fabrice.

  
• arsal_go

  January 2023

  Dear @eduard and @Fab

  Thank you so much for your responses :). I thought importing csv files was not supported, but that's because my OpenSesame version was not updated! I am going to try and go with Eduard solution, since I am lacking knowledge on Javascript programming, but thank you so much for that link to your thread, it's incredibly useful.

  Best,

  Arsal