randomising source block loop

Vivver

Hi,

In my experiment, the stimuli are comprised of 14 word triplets in which the order of the 14 words and the order of the triplets have to be randomised. The triplets should be presented as triplets, i.e. not as 42 randomised words. I created 14 separate csv files for every triplet but I don't know how to tell the block loop to randomise the order of the files as well as the order of the content of the files.

Thank you in advance for your help!

lvanderlinden

Hi @Vivver ,

Perhaps the shuffle_hor function can be of help:

• https://osdoc.cogsci.nl/3.3/manual/structure/loop/#shuffle_horiz

Does this answer your question?

Cheers,

Lotje

Vivver

Hi @lvanderlinden

thank you, that is very helpful!

I created a .csv file now with a column for every triplet and every word of the triplet in the three rows below.

I am not sure, however, where I would enter the 'shuffle_horiz' command. Do I write this in the script? If so, where?

Best,

Vivienne

eduard

Hi Vivienne,

On the link that Lotje shared, it says further up "You can add constraints for pseudorandomization to the script of the loop item. This shuffles the rows, even if Order is set to sequential. (Currently, this is not possible through the GUI.)"

This is where you have to add the horizontal shuffling. So, go to the loop table, and in the top right, you can activite the script view, there you can add a line that specifies which variable you want to shuffle horizontally.

That being said, I am not sure horizontal shuffling is what you need (but maybe I am misunderstanding your need). In order to choose one of the 14 files randomly, horizontal shuffling won't help you. In order to do so, you would need to code the file name that you use in the loop table to load the triplets as a variable. For example, triplet_list_[list_nr].csv where list_nr would have a value from 1 to 14. How exactly you can implement that, depends a bit on what you need. For example, should all 14 lists be shown for one subject? Or is it one list per experimental session? Knowing that I can suggest a more concrete solution.

Eduard