[solved] Conditioned Randomisation across the trial sequence

mfp49

Hi
I have two sets of word stimuli with a relation between them (e.g., Shorter Than [ST] or Taller Than [TT]) to be learned by participants.

Therefore, the loop looks like the following link:

Each of trials will be showed one time, but since the relationship is different, it could happen for two trials to be the same exact for the relation between them. Therefore, the same pair should not be presented successively twice (as this could happen at the point of transition between the first and the second random sequence).
Is there any way to put the limitation on the randomization order to prevent from the repetition?
Thanks,
Masoud

sebastiaan

Hi Masoud,

Pseudo-randomization has come up a few times before on this forum. There is unfortunately not (yet) a very user-friendly way to implement this, but you can a) generate pseudo-random lists with external software, or b) use a Python script.

Perhaps these discussions will get you started:

• http://forum.cogsci.nl/index.php?p=/discussion/310
• http://forum.cogsci.nl/index.php?p=/discussion/80/

Cheers!
Sebastiaan