Hello, I am doing an experiment that involves presenting 4 images on each trial. I would like to present the images in a 2 x 2 square, but have the images randomized to a position every time the experiment is run.
For example, if I had images 1, 2, 3, and 4:
Participant 1, Trial 1 sees this:
Participant 2, Trial 1 sees this:
I hope that makes sense.
I understand that you can randomize the images in trials, but that's only if you want to present them in a row or a column. Is that correct?
Also, in the /trialduration property of <trial>, I would like to set a number of milliseconds only if a certain constraint is satisfied, i.e. /trialduration = [if (values.timer==1) 90000 else 99999999]. I thought this would work as the if statement would return an integer. I really wish this worked...
Lastly, I would like to redirect my participants to a survey website after the experiment, but pass along their subject ID to the URL. Kinda like what was going on here. But how do I access that subject number? Is it unique for every participant?
Any help would be greatly appreciated.