I have an experiment where two participants need to make decisions sequentially. At the beginning of each trial they see an arrow pointing up or down, depending on who has to make the decision during that trial (Participant 1 = arrow up; Participant 2 = arrow down). Then, during the trial, one of them makes a decision by clicking on randomly presented pictures.
What I need to do is to present the arrows sequentially (up, down, up, down, etc) before each trial, so that during the first trial Participant 1 makes a decision, in the second trial Participant 2, third trial Participant 1, fourth trial Participant 2, and so on (i.e. turn-taking). This is the overall structure I have so far in the Builder:
arrows stimuli I’ve defined the variable
$arrow_dir, which is one of the column labels from the excel file where I have defined the two pictures (
Whenever I run the script it either shows both arrows one after the other, or one but in a totally randomized order across trials. Any idea of how to do this?