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permutations of pseudo-random ordering for a psychology experiment

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Nicholas
Nicholas on 17 Oct 2013
Answered: Gaven Henry on 25 Aug 2021
I need help creating code to conduct a permutation of a sequential list (vector) of pairs of 3 image types, separated by pre-specified distances, for an experiment with the following conditions:
120 trial list. Each trial is 1 image.
Type A Pairs - 20 images - images are presented twice in the list. 4 pairs, separated by 5 trials 4 pairs, separated by 10 trials 4 pairs, separated by 15 trials 4 pairs, separated by 20 trials 4 pairs, separated by 25 trials
Type B Pairs - 40 images, each image of the pair is presented once. 4 pairs, separated by 5 trials 4 pairs, separated by 10 trials 4 pairs, separated by 15 trials 4 pairs, separated by 20 trials 4 pairs, separated by 25 trials
Type C Images - 40 images, each image is presented once. These can fill the spaces between the above pairs.
Any help would be most appreciated.

Answers (1)

Gaven Henry
Gaven Henry on 25 Aug 2021
Cool, I've been through similar experiments before and it was extremely challenging for me. But at least it helped me psychologically. So if you're interested, there are competent specialists there who can help even if the situation is difficult and close to depression. Because a lot of people have stresses and difficulties now, so I think that a competent therapist will never be superfluous. Good luck.

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