I’ve been reading through a lot of past posts, but there’s one issue that I haven’t been able to deal with. What I’m trying to build is an experiment where I want to randomly display two categories of images: stressful ones and relaxing ones. More specifically, I would like to display to participants 3 images for 6 seconds with 1 second blank between each one and a period of 20 seconds at the end of the trial. So the paradigm would be like this :
1S + blank + 1S + blank + 1S + rest (x5)
1NS + blank + 1NS + blank + 1NS + rest (x5)
(S : stressful; NS : no stressful)
I have managed to randomly display stressful or no stressful pictures by creating two lists of images but the issue is that I always have stressful pictures first (repeated 5 times) then no stressful images (repeated 5 times).
So, I would like to build 5 blocs with 10 trials (5 stressful and 5 non-stressful; pseudo-randomized). I don’t know if this is possible, but I would like to create a single list of images (stressful and no-stressful) and add a condition where if the first picture selected is stressful, then the two followings have to be stressful as well. Same goes with no-stressful pictures.
Does anyone have any advice ?
Thanks in advance for your time and assistance !