Images and sounds randomization
Hello everyone,
Hope that you are fine! To begin with, in my experiment I want to have 40 images and 2 sounds (ascending, descending) presented at the same time. I also need each image to be presented only once in every trial, which means that I'll have 20 images with the ascending and 20 with the descending sound per participant. However, these 20 images should not be the same for every participant. Moreover, at the end of the experimental procedure every picture should have been equally matched with every sound. For example if I have 30 participants in total, I don't want picture number 3 to be matched 20 times with ascending and just 10 times with descending sound, but rather be a 15-15 case. I hope that I made myself clear ^-^
Any thoughts on how I can achieve something like this in Open Sesame?
P.S. I am an undergraduate student that doesn't know how to program :/
Thanks in advance!
Vasileia
Comments
Hi @Vasileia_chr,
I'm not sure I fully understand your description but if you want to achieve a full counterbalancing of conditions across participants, my suggestion is that you create lists of trials in .csv files and that you load these up in the loop based on the participant's number. To my knowledge, it would be the only option, since generating a random sequence within the task would not allow you to go access the stimuli characteristics generated for previous participants.So my advice to you is to use some programming language outside Open Sesame to create a large set of possible stimuli lists as csv files.
Good luck!
Fabrice.
Thanks a lot!