Millisecond Forums

Hello:) I have a question considering my experiment for my Bachelor thesis. The Experiment is supposed to look like that: You see a word (one of 30, these 30 are split in 3 Groups which are the conditions, each has 10 words), after you see a Face (1 of 90) and then a mask. I want to show each Face with each condition only once. So one face with group 1,2 & , which means 270 Trials. This is my script (the Target ist the face), and unfortunately sometimes a face comes with the same conditions, instead of one face with 3 different conditions. Can you help me?

<expt main_A>
/subjects = (1 of 2)
/groupassignment = random
/blocks = [1=intro_0; 2=practice_A; 3=experiment_A; 4=scale_cm; 5=demographics; 6=Versuchspersonenstunden]
/postinstructions = (end)
</expt>

<block experiment_A>
/trials=[1-270=replacenorepeat(priming_highagency_A, priming_averageagency_A, priming_lowagency_A)]
/bgstim = (A_l, A_r)
</block>

<trial priming_highagency_A>
/timeout = values.timeout
/pretrialpause = values.pretrialpause
/stimulustimes = [0=cross; 500=noreplace(priming_highagency); 750=grey; 800= noreplace(Target); 900=mask]
/validresponse = ("f", "j")
/correctresponse = ("f", "j")
/branch = [if (trial.priming_highagency_A.correct) trial.gap]
/branch = [if (trial.priming_highagency_A.response == 0) trial.feedback_late]
</trial>

<trial priming_averageagency_A>
/timeout = values.timeout
/pretrialpause = values.pretrialpause
/stimulustimes = [0=cross; 500=noreplace(priming_averageagency); 750=grey; 800= noreplace(Target); 900=mask]
/validresponse = ("f", "j")
/correctresponse = ("f", "j")
/branch = [if (trial.priming_averageagency_A.correct) trial.gap]
/branch = [if (trial.priming_averageagency_A.response == 0) trial.feedback_late]
</trial>

<trial priming_lowagency_A>
/timeout = values.timeout
/pretrialpause = values.pretrialpause
/stimulustimes = [0=cross; 500=noreplace(priming_lowagency); 750=grey; 800= noreplace(Target); 900=mask]
/validresponse = ("f", "j")
/correctresponse = ("f", "j")
/branch = [if (trial.priming_lowagency_A.correct) trial.gap]
/branch = [if (trial.priming_lowagency_A.response == 0) trial.feedback_late]
</trial>