Hello,I'm currently working on a research study whereby participants are shown images one at a time for 3secs from 3 different image categories (10 pictures from each category). These images are shown in a randomised order and from a selection of 30 pictures in each category. After each image is shown, participants then answer a question on a separate follow-up screen asking how bright/how much the image moves them. This order is repeated so participants see an image, answer the question, see the image then answer the question, and so on.After this, we want participants to then in a different block see half of the images from each category randomly shown again along with images they haven't been seen before and then rate each image as new or old. This order will be the same as before as in an image will be shown followed by the question (is it new/old) and will repeat.The problem we are having is how to randomise the pictures in terms of categories so a certain number of each is select
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