Randomization order of stimuli
I'am struggling with the set up of an experiment where I want to present X's and O's in a 3x3 grid at predefinied positions but at random order. Most important is that the stimuli should stay on the screen until 7 stimuli are presented (so adding stimuli one after another always after 600ms). I already watched the tutorial on the visual search experiment but can't finde any solution for defining the onset or the order of stimuli but not the position.
Many thanks in advance,