Images and sounds randomization
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!