Hi, I am very new to this so please excuse my lack of experience.
I am designing an experiment that comprises 12 visual stimuli which will appear in sequential triplets, hence they have to appear together in groups of 3 (eg pic1, pic2, pic3 have to appear in that order). This all works fine. However, sometimes one of the triplets will be repeated twice, eg. pic1, pic1, pic2, pic 3. Please advise how I can define this in - is this a run if statement? Furthermore, if a picture is seen twice, participant has to verify that they have noticed this. How would I set this up? This would only be when a picture has been shown twice in a row, not with normally appearing triplets.
Thank you in advance!