In my experiment I want to build a grid of 16 positions and show between 3 and 8 squares randomly on the screen at random positions. The number of stimuli should change randomly on each of the ten trials.
So far, I used the builder and I can only present each stimuli at predefined positions (I defined them in the position field of each of the 16 image components) which means, the positions where the stimuli appear are the same for each trial, as well as the number of shown squares because I assigned the sqaure to each of the image components in order for them to be shown.
My question is now, how can I make the position of the shown stimuli completely random and the number between 3 and 8?
Do I have to solve this by going down to the code level and change it there?
Thank you in advance for your help